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go_spec: consistent use of 'low', 'high' in slices section
Also: Added examples for slices with omitted index expressions. R=r, rsc CC=golang-dev https://golang.org/cl/2106047
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@ -2426,14 +2426,14 @@ For a string, array, or slice <code>a</code>, the primary expression
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</p>
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<pre>
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a[lo : hi]
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a[low : high]
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</pre>
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<p>
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constructs a substring or slice. The index expressions <code>lo</code> and
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<code>hi</code> select which elements appear in the result. The result has
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constructs a substring or slice. The index expressions <code>low</code> and
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<code>high</code> select which elements appear in the result. The result has
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indexes starting at 0 and length equal to
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<code>hi</code> - <code>lo</code>.
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<code>high</code> - <code>low</code>.
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After slicing the array <code>a</code>
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</p>
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@ -2453,11 +2453,17 @@ s[2] == 4
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</pre>
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<p>
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For convenience, any of the index expressions may be omitted. A missing low
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index defaults to zero; a missing high index defaults to the length of the
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array, slice, or string.
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For convenience, any of the index expressions may be omitted. A missing <code>low</code>
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index defaults to zero; a missing <code>high</code> index defaults to the length of the
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sliced operand:
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</p>
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<pre>
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a[2:] // same a[2 : len(a)]
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a[:3] // same as a[0 : 3]
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a[:] // same as a[0 : len(a)]
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</pre>
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<p>
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For arrays or strings, the indexes <code>low</code> and <code>high</code> must
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satisfy 0 <= <code>low</code> <= <code>high</code> <= length; for
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