doc: fix typo and improve docs for sorting

tagcmp.go

@@ -18,7 +18,7 @@ type Tag struct {
 	UsesV        bool   // whether or not the tag uses the "v" prefix
 }
 
-// ByTag sorts tags
+// ByTag sorts tags in asc/desc order where the last element is the latest tag.
 type ByTag []Tag
 
 func (t ByTag) Len() int      { return len(t) }
@@ -299,8 +299,8 @@ func Parse(tag string) (Tag, error) {
 	return parsedTag, nil
 }
 
-// IsParseable determines if a tag is supported by this library
-func IsParseable(tag string) bool {
+// IsParsable determines if a tag is supported by this library
+func IsParsable(tag string) bool {
 	if _, err := Parse(tag); err != nil {
 		return false
 	}