pattern: fix outdated comment, and add godoc links

TranslatePattern and QuotePattern were renamed Regexp and QuoteMeta
in 2019 when code was moved out "syntax" package to "pattern" one.

See 2e72e3c

pattern/pattern.go

@@ -282,8 +282,8 @@ func charClass(s string) (string, error) {
 // For example, HasMeta(`foo\*bar`) returns false, but HasMeta(`foo*bar`)
 // returns true.
 //
-// This can be useful to avoid extra work, like TranslatePattern. Note that this
-// function cannot be used to avoid QuotePattern, as backslashes are quoted by
+// This can be useful to avoid extra work, like [Regexp]. Note that this
+// function cannot be used to avoid [QuoteMeta], as backslashes are quoted by
 // that function but ignored here.
 func HasMeta(pat string, mode Mode) bool {
 	for i := 0; i < len(pat); i++ {