Fix doc

docs/configuration.asciidoc

@@ -466,7 +466,7 @@ Setting a value here will *overwrite* the defaults, so be sure to include the de
 NOTE: Sensitive information should not be sent in the query string. Data in the query string is considered non-sensitive.
 See https://www.owasp.org/index.php/Information_exposure_through_query_strings_in_url[owasp.org] for more information.
 
-====== `Cookie` header sanitization
+*`Cookie` header sanitization:*
 
 The `Cookie` header is automatically redacted for incoming HTTP request transactions. Each name-value pair from the 
 Cookie header is parsed by the agent and sent to the APM Server. Before the name-value pairs are recorded, they are