Fix some RST issues

Author: javiereguiluz

http_client.rst

@@ -167,8 +167,9 @@ Some options are described in this guide:
 Check out the full :ref:`http_client config reference <reference-http-client>`
 to learn about all the options.
 
-The HTTP client also has one configuration option called
-``max_host_connections``, this option can not be overridden by a request:
+The HTTP client also has a configuration option called
+:ref:`max_host_connections <reference-http-client-max-host-connections>`.
+This option cannot be overridden per request:
 
 .. configuration-block::
 
@@ -1355,9 +1356,8 @@ code waits only when necessary.
     or access to certificate files). To avoid hitting these limits, consider
     processing requests in batches.
 
-    There is however a maximum amount of concurrent connections that can be open
-    per host (6 by default). See
-    :doc:`max_host_connections </configuration/framework.html#max-host-connections>`.
+    There is, however, a maximum amount of concurrent connections that can be open
+    per host (``6`` by default). See :ref:`max_host_connections <reference-http-client-max-host-connections>`.
 
 Multiplexing Responses
 ~~~~~~~~~~~~~~~~~~~~~~

reference/configuration/framework.rst

@@ -1129,6 +1129,8 @@ max_duration
 The maximum execution time, in seconds, that the request and the response are
 allowed to take. A value lower than or equal to 0 means it is unlimited.
 
+.. _reference-http-client-max-host-connections:
+
 max_host_connections
 ....................