Fix anchor.

Author: jcamiel

sites/hurl.dev/_docs/capturing-response.md

@@ -67,7 +67,7 @@ A query can be of the following type:
 - [`regex`](#regex-capture)
 - [`variable`](#variable-capture)
 - [`duration`](#duration-capture)
-- [`certificate`](#certificate-capture)
+- [`certificate`](#ssl-certificate-capture)
 
 Extracted data can then be further refined using [filters].