Docs: add doc premature reset stat. (#35832)

Commit Message: Docs: add doc premature reset stat.
Additional Description: Was missed in
230331f
Risk Level: low
Testing: low
Docs Changes: yes
Release Notes: n/a
Platform Specific Features: n/a

Signed-off-by: Kevin Baichoo <envoy@kevinbaichoo.com>

docs/root/configuration/http/http_conn_man/stats.rst

@@ -67,6 +67,7 @@ statistics:
    ``downstream_rq_timeout``, Counter, Total requests closed due to a timeout on the request path
    ``downstream_rq_overload_close``, Counter, Total requests closed due to Envoy overload
    ``downstream_rq_redirected_with_normalized_path``, Counter, Total requests redirected due to different original and normalized URL paths. This action is configured by setting the :ref:`path_with_escaped_slashes_action <envoy_v3_api_field_extensions.filters.network.http_connection_manager.v3.HttpConnectionManager.path_with_escaped_slashes_action>` config option.
+   ``downstream_rq_too_many_premature_resets``, Counter, Total number of connections closed due to too many premature request resets on the connection.
    ``rs_too_large``, Counter, Total response errors due to buffering an overly large body
 
 .. _config_http_conn_man_stats_per_ua: