Enhance config cheat sheet on passwd quoting (#13158)

See #13126

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -301,7 +301,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `HOST`: **127.0.0.1:3306**: Database host address and port or absolute path for unix socket \[mysql, postgres\] (ex: /var/run/mysqld/mysqld.sock).
 - `NAME`: **gitea**: Database name.
 - `USER`: **root**: Database username.
-- `PASSWD`: **\<empty\>**: Database user password. Use \`your password\` for quoting if you use special characters in the password.
+- `PASSWD`: **\<empty\>**: Database user password. Use \`your password\` or """your password""" for quoting if you use special characters in the password.
 - `SCHEMA`: **\<empty\>**: For PostgreSQL only, schema to use if different from "public". The schema must exist beforehand,
   the user must have creation privileges on it, and the user search path must be set to the look into the schema first 
   (e.g. `ALTER USER user SET SEARCH_PATH = schema_name,"$user",public;`).