Update rate_limiter.rst

Co-authored-by: Oskar Stark <oskarstark@googlemail.com>

Author: dunglas

rate_limiter.rst

@@ -537,7 +537,7 @@ you can use a specific :ref:`named lock <lock-named-locks>` via the
 .. _`DoS attacks`: https://cheatsheetseries.owasp.org/cheatsheets/Denial_of_Service_Cheat_Sheet.html
 .. _`Apache mod_ratelimit`: https://httpd.apache.org/docs/current/mod/mod_ratelimit.html
 .. _`NGINX rate limiting`: https://www.nginx.com/blog/rate-limiting-nginx/
-.. `Caddy HTTP rate limit module`: https://github.com/mholt/caddy-ratelimit
+.. _`Caddy HTTP rate limit module`: https://github.com/mholt/caddy-ratelimit
 .. _`token bucket algorithm`: https://en.wikipedia.org/wiki/Token_bucket
 .. _`PHP date relative formats`: https://www.php.net/manual/en/datetime.formats.php#datetime.formats.relative
 .. _`Race conditions`: https://en.wikipedia.org/wiki/Race_condition