improve description for parser param

src/plugins.js

@@ -39,9 +39,9 @@ class BasePlugin {
    *   `dotRelative` option. This means relative paths in the current directory
    *   will be prefixed with `./` (or `.\` on Windows) even if this was not
    *   present in the input filename or pattern.
-   * @param {string | undefined} parser - If this filename matched a file parser
-   *   the user has specified in a custom schema, this will be passed to
-   *   `parseFile` in the `parser` param.
+   * @param {string | undefined} parser - If the user has specified a parser to
+   *   use for this file in a custom schema, this will be passed to `parseFile`
+   *   in the `parser` param.
    * @returns {Document | undefined} Parsed file contents
    */
   // eslint-disable-next-line no-unused-vars