go/types, types2: clean up a few typos, and an unused const

Change-Id: I01717cc52c9728b4eaaf2c996707f59a113bff9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/395434
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/compile/internal/types2/infer.go

@@ -355,7 +355,7 @@ func typeParamsString(list []*TypeParam) string {
 	return b.String()
 }
 
-// IsParameterized reports whether typ contains any of the type parameters of tparams.
+// isParameterized reports whether typ contains any of the type parameters of tparams.
 func isParameterized(tparams []*TypeParam, typ Type) bool {
 	w := tpWalker{
 		seen:    make(map[Type]bool),

src/cmd/compile/internal/types2/named.go

@@ -138,7 +138,7 @@ func (t *Named) Method(i int) *Func {
 	})
 }
 
-// instiateMethod instantiates the i'th method for an instantiated receiver.
+// instantiateMethod instantiates the i'th method for an instantiated receiver.
 func (t *Named) instantiateMethod(i int) *Func {
 	assert(t.TypeArgs().Len() > 0) // t must be an instance
 

src/go/types/api.go

@@ -34,8 +34,6 @@ import (
 	"go/token"
 )
 
-const allowTypeLists = false
-
 // An Error describes a type-checking error; it implements the error interface.
 // A "soft" error is an error that still permits a valid interpretation of a
 // package (such as "unused variable"); "hard" errors may lead to unpredictable

src/go/types/infer.go

@@ -354,7 +354,7 @@ func typeParamsString(list []*TypeParam) string {
 	return b.String()
 }
 
-// IsParameterized reports whether typ contains any of the type parameters of tparams.
+// isParameterized reports whether typ contains any of the type parameters of tparams.
 func isParameterized(tparams []*TypeParam, typ Type) bool {
 	w := tpWalker{
 		seen:    make(map[Type]bool),

src/go/types/named.go

@@ -140,7 +140,7 @@ func (t *Named) Method(i int) *Func {
 	})
 }
 
-// instiateMethod instantiates the i'th method for an instantiated receiver.
+// instantiateMethod instantiates the i'th method for an instantiated receiver.
 func (t *Named) instantiateMethod(i int) *Func {
 	assert(t.TypeArgs().Len() > 0) // t must be an instance