Apply suggestion from @jakebailey

Author: jakebailey

src/lib/es2020.string.d.ts

@@ -6,7 +6,7 @@ interface String {
     /**
      * Matches a string with a regular expression, and returns an iterable of matches
      * containing the results of that search.
-     * @param regexp A variable name or string literal containing the regular expression pattern and flags.
+     * @param regexp A regular expression
      */
     matchAll(regexp: RegExp): RegExpStringIterator<RegExpExecArray>;