Fix comment

string/index.go

@@ -105,8 +105,8 @@ func IndexAllIgnoreCaseUnicode(haystack string, needle string, limit int) [][]in
 	// If the needle is over some amount of characters long you chop off the first few
 	// and then search for those. However this means you are not finding actual matches and as such
 	// you the need to validate a potential match after you have found one.
-	// In this case the confirmation match is done using regular expressions
-	// because its faster than checking for all case options for longer needles.
+	// The confirmation match is done in a loop because for some literals regular expression
+	// is still to slow, although for most its a valid option.
 
 	locs := [][]int{}
 	// Char limit is the cut-off where we switch from all case permutations