spec: document that string conversions don't guarantee result slice capacity

Fixes #24163.

Change-Id: If389c4abf3b9b6e4eba6f31c3c12779329456df6
Reviewed-on: https://go-review.googlesource.com/c/go/+/637655
Reviewed-by: Robert Griesemer <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Robert Griesemer <[email protected]>
TryBot-Bypass: Robert Griesemer <[email protected]>

Author: griesemer

doc/go_spec.html

@@ -5686,6 +5686,8 @@ <h4 id="Conversions_to_and_from_a_string_type">Conversions to and from a string
 <li>
 Converting a value of a string type to a slice of bytes type
 yields a non-nil slice whose successive elements are the bytes of the string.
+The <a href="#Length_and_capacity">capacity</a> of the resulting slice is
+implementation-specific and may be larger than the slice length.
 
 <pre>
 []byte("hellø")             // []byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'}
@@ -5701,6 +5703,8 @@ <h4 id="Conversions_to_and_from_a_string_type">Conversions to and from a string
 <li>
 Converting a value of a string type to a slice of runes type
 yields a slice containing the individual Unicode code points of the string.
+The <a href="#Length_and_capacity">capacity</a> of the resulting slice is
+implementation-specific and may be larger than the slice length.
 
 <pre>
 []rune(myString("白鵬翔"))   // []rune{0x767d, 0x9d6c, 0x7fd4}