all: fix a few function names on comments

Change-Id: Ibdf787b7a62e8201393f2a4487cd8c67d8b0c91d
Reviewed-on: https://go-review.googlesource.com/c/text/+/441717
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>

internal/language/lookup.go

diff --git a/internal/language/lookup.go b/internal/language/lookup.go
index 9309dc2..231b4fb 100644
--- a/internal/language/lookup.go
+++ b/internal/language/lookup.go
@@ -50,7 +50,7 @@
 	return normLang(id)
 }
 
-// mapLang returns the mapped langID of id according to mapping m.
+// normLang returns the mapped langID of id according to mapping m.
 func normLang(id Language) (Language, AliasType) {
 	k := sort.Search(len(AliasMap), func(i int) bool {
 		return AliasMap[i].From >= uint16(id)

runes/runes.go

diff --git a/runes/runes.go b/runes/runes.go
index 7193369..930e87f 100644
--- a/runes/runes.go
+++ b/runes/runes.go
@@ -33,7 +33,7 @@
 	return setFunc(func(r rune) bool { return unicode.Is(rt, r) })
 }
 
-// In creates a Set with a Contains method that returns true for all runes not
+// NotIn creates a Set with a Contains method that returns true for all runes not
 // in the given RangeTable.
 func NotIn(rt *unicode.RangeTable) Set {
 	return setFunc(func(r rune) bool { return !unicode.Is(rt, r) })

unicode/cldr/collate.go

diff --git a/unicode/cldr/collate.go b/unicode/cldr/collate.go
index 056fe7f..5794ae4 100644
--- a/unicode/cldr/collate.go
+++ b/unicode/cldr/collate.go
@@ -229,7 +229,7 @@
 	return strings.TrimLeftFunc(s, unicode.IsSpace)
 }
 
-// consumes returns whether the next byte is ch. If so, it gobbles it by
+// consume returns whether the next byte is ch. If so, it gobbles it by
 // updating s.
 func consume(s *string, ch byte) (ok bool) {
 	if *s == "" || (*s)[0] != ch {