docs: add @Used-By

Author: kenjis

system/Debug/BaseExceptionHandler.php

@@ -118,6 +118,8 @@ protected function maskSensitiveData(&$trace, array $keysToMask, string $path =
     /**
      * Describes memory usage in real-world units. Intended for use
      * with memory_get_usage, etc.
+     *
+     * @used-by app/Views/errors/html/error_exception.php
      */
     protected static function describeMemory(int $bytes): string
     {
@@ -135,6 +137,8 @@ protected static function describeMemory(int $bytes): string
     /**
      * Creates a syntax-highlighted version of a PHP file.
      *
+     * @used-by app/Views/errors/html/error_exception.php
+     *
      * @return bool|string
      */
     protected static function highlightFile(string $file, int $lineNumber, int $lines = 15)