docs: add JSDoc headers to all externally exported store functions

src/store/google_auth/removeAllowedEmail.js

@@ -1,5 +1,15 @@
 import { REMOVE_ALLOWED_EMAIL } from '../../sql/google_auth.js';
 
+/**
+ * Removes an allowed Google auth email.
+ *
+ * @param {object} pool - The mssql connection pool.
+ * @returns {Function} An async function that removes an allowed email.
+ *
+ * @example
+ * const fn = removeAllowedEmail(pool);
+ * await fn('user@example.com');
+ */
 export default function removeAllowedEmail(pool) {
   return async (email) => {
     await pool