tweak documentation of commands

so that first sentence is better for cmd page.

live at http://r45:3456/cmd/

R=gri, r
http://go/go-review/1024034

src/cmd/5a/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-5a is a version of the Plan 9 assembler documented at
+5a is a version of the Plan 9 assembler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2a
 

src/cmd/5c/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-5c is a version of the Plan 9 C compiler documented at
+5c is a version of the Plan 9 C compiler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2c
 

src/cmd/5g/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-5g is the version of the gc compiler for the ARM,
+5g is the version of the gc compiler for the ARM.
-referred to by these tools as arm.
+The $GOARCH for these tools is arm.
 
 It reads .go files and outputs .5 files. The flags are documented in ../gc/doc.go.
 

src/cmd/5l/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-5l is a modified version of the Plan 9 linker documented at
+5l is a modified version of the Plan 9 linker.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2l
 

src/cmd/6a/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-6a is a version of the Plan 9 assembler documented at
+6a is a version of the Plan 9 assembler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2a
 

src/cmd/6c/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-6c is a version of the Plan 9 C compiler documented at
+6c is a version of the Plan 9 C compiler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2c
 

src/cmd/6g/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-6g is the version of the gc compiler for the x86-64,
+6g is the version of the gc compiler for the x86-64.
-referred to by these tools as amd64.
+The $GOARCH for these tools is amd64.
 
 It reads .go files and outputs .6 files. The flags are documented in ../gc/doc.go.
 

src/cmd/6l/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-6l is a modified version of the Plan 9 linker documented at
+6l is a modified version of the Plan 9 linker.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2l
 

src/cmd/8a/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-8a is a version of the Plan 9 assembler documented at
+8a is a version of the Plan 9 assembler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2a
 

src/cmd/8c/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-8c is a version of the Plan 9 C compiler documented at
+8c is a version of the Plan 9 C compiler.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2c
 

src/cmd/8g/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-8g is the version of the gc compiler for the x86,
+8g is the version of the gc compiler for the x86.
-referred to by these tools for historical reasons as 386.
+The $GOARCH for these tools is 386.
 
 It reads .go files and outputs .8 files. The flags are documented in ../gc/doc.go.
 

src/cmd/8l/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-8l is a modified version of the Plan 9 linker documented at
+8l is a modified version of the Plan 9 linker.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/2l
 

src/cmd/cc/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-This directory contains the portable section of the Plan 9 C compilers as
+This directory contains the portable section of the Plan 9 C compilers.
-represented here.  See ../6c, ../8c, and ../5c for more information.
+See ../6c, ../8c, and ../5c for more information.
 
 */
 package documentation

src/cmd/ebnflint/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-The ebnflint program verifies that EBNF productions in an HTML document
+Ebnflint verifies that EBNF productions are consistent and gramatically correct.
-such as the Go specification document are consistent and grammatically correct.
+It reads them from an HTML document such as the Go specification.
 
 Grammar productions are grouped in boxes demarcated by the HTML elements
 	<pre class="ebnf">

src/cmd/gc/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-The name gc is the generic label given to the family of Go compilers
+Gc is the generic label for the family of Go compilers
 that function as part of the (modified) Plan 9 tool chain.  The C compiler
 documentation at
 

src/cmd/godoc/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-The godoc program extracts and generates documentation for Go programs.
+Godoc extracts and generates documentation for Go programs.
 
 It has two modes.
 

src/cmd/gofmt/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-The gofmt program is a formatter for Go programs.
+Gofmt formats Go programs.
 
 Without an explicit path, it processes the standard input.  Given a file,
 it operates on that file; given a directory, it operates on all .go files in

src/cmd/gopack/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-The gopack program is a variant of the Plan 9 ar tool documented at
+Gopack program is a variant of the Plan 9 ar tool.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/ar
 

src/cmd/gotest/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-The gotest program is an automated testing tool for Go packages.
+Gotest is an automated testing tool for Go packages.
 
 Normally a Go package is compiled without its test files.  Gotest
 is a simple script that recompiles the package along with any files

src/cmd/goyacc/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-The program goyacc is a version of yacc written in Go and generating
+Goyacc is a version of yacc for Go.
-as output a parser also in Go.
+It is written in Go and generates parsers written in Go.
 
 It is largely transliterated from the Inferno version written in Limbo
 which in turn was largely transliterated from the Plan 9 version

src/cmd/hgpatch/doc.go

@@ -4,11 +4,10 @@
 
 /*
 
-Hgpatch reads a patch, which should have been generated by
+Hgpatch applies a patch to the local Mercurial repository.
-a version control system like CVS, GIT, Mercurial, or Subversion,
+The patch should have been been generated by
-from a file (or standard input) and applies that patch to the local
+a version control system like CVS, GIT, Mercurial, or Subversion.
-Mercurial repository.  If successful, it writes a list of affected
+If successful, hgpatch writes a list of affected files to standard output.
-files to standard output.
 
 Hgpatch is meant to be used by the Mercurial codereview extension.
 

src/cmd/ld/doc.go

@@ -4,8 +4,8 @@
 
 /*
 
-This directory contains the portable section of the Plan 9 C linkers as
+This directory contains the portable section of the Plan 9 C linkers.
-represented here.  See ../6l, ../8l, and ../5l for more information.
+See ../6l, ../8l, and ../5l for more information.
 
 */
 package documentation

src/cmd/nm/doc.go

@@ -4,7 +4,7 @@
 
 /*
 
-This nm is a version of the Plan 9 nm command documented at
+Nm is a version of the Plan 9 nm command.  The original is documented at
 
 	http://plan9.bell-labs.com/magic/man2html/1/nm