General: add @SInCE etc, as suggested by SirLouen

Author: arnt

src/wp-includes/formatting.php

@@ -2145,8 +2145,13 @@ function sanitize_file_name( $filename ) {
  * the first block for that script, and then checks that the string
  * uses only a single block. This works for the scripts currently in
  * Unicode, and will work for future scripts as long as the committee
- * keeps estimating correctly, so there's only one block for each
+ * keeps estimating high enough, so there's only one block for each
  * future script.
+ *
+ * @since 6.9.0
+ *
+ * @param $input A string to check
+ * @return true if all letters in the string belong to the same unicode script, and false if letters fromm two more more scripts are included.
  */
 
 function uses_single_unicode_script( $input ) {

tests/phpunit/tests/formatting/sanitizeUser.php

@@ -38,6 +38,10 @@ public function test_strips_encoded_ampersand_when_followed_by_semicolon() {
 	}
 
 	/*
+	 * Some languages use the Latin alphabet with various accents.
+	 * The city Münster is in Germany, Orléans is in France. This
+	 * test checks that an author (a user name) can use an accent.
+	 *
 	 * @ticket 31992
 	 */
 
@@ -65,6 +69,13 @@ public function test_accepts_all_arabic() {
 	}
 
 	/*
+	 * Some languages use the Latin alphabet with various
+	 * extra letters. The city Bodø is in Norway, Gießen in
+	 * Germany. This test checks that an author (a user name) can
+	 * use such an extended Latin letter. (The letter used, ɔ, is
+	 * like the o in top, and used in various countries in West
+	 * Africa.)
+	 *
 	 * @ticket 31992
 	 */
 
@@ -80,6 +91,13 @@ public function test_accepts_west_african_latin() {
 	}
 
 	/*
+	 * Some people are worried about using letters that look alike
+	 * from different alphabets, for example the Cyrillic V looks
+	 * exactly like the Latin B. If any user names use confusable
+	 * letters like that pair, people are sure to have trouble
+	 * logging in, so we try to prevent people from painting
+	 * themselves into that corner.
+	 *
 	 * @ticket 31992
 	 */