Issue #3118581 by kiamlaluno: The documentation for Crypt::randomBytesBase64()...

Issue #3118581 by kiamlaluno: The documentation for Crypt::randomBytesBase64() is wrong about the output length

(cherry picked from commit d2d8fc93)
(cherry picked from commit 192a49e9)

core/lib/Drupal/Component/Utility/Crypt.php

@@ -108,7 +108,8 @@ public static function hashEquals($known_string, $user_string) {
    *   The number of random bytes to fetch and base64 encode.
    *
    * @return string
-   *   The base64 encoded result will have a length of up to 4 * $count.
+   *   A base-64 encoded string, with + replaced with -, / with _ and any =
+   *   padding characters removed.
    *
    * @see \Drupal\Component\Utility\Crypt::randomBytes()
    */