WinRM: Add operation and read timeout variables to docs (#24922)

* Add operation and read timeout variables to docs

Since WinRM is not the most reliable protocol, it may be necessary to increase its timeout values to get a better experience.

* Update intro_windows.rst

Great idea to add this.
I changed 'experienced' -> 'experience' (present continuous rather than past tense).  Added some . to be consistent with other lines.

docs/docsite/rst/intro_windows.rst

@@ -290,8 +290,10 @@ Since 2.0, the following custom inventory variables are also supported for addit
 * ``ansible_winrm_path``: Specify an alternate path to the WinRM endpoint.  Ansible uses ``/wsman`` by default.
 * ``ansible_winrm_realm``: Specify the realm to use for Kerberos authentication.  If the username contains ``@``, Ansible will use the part of the username after ``@`` by default.
 * ``ansible_winrm_transport``: Specify one or more transports as a comma-separated list.  By default, Ansible will use ``kerberos,plaintext`` if the ``kerberos`` module is installed and a realm is defined, otherwise ``plaintext``.
-* ``ansible_winrm_server_cert_validation``: Specify the server certificate validation mode (``ignore`` or ``validate``). Ansible defaults to ``validate`` on Python 2.7.9 and higher, which will result in certificate validation errors against the Windows self-signed certificates. Unless verifiable certificates have been configured on the WinRM listeners, this should be set to ``ignore``
+* ``ansible_winrm_server_cert_validation``: Specify the server certificate validation mode (``ignore`` or ``validate``). Ansible defaults to ``validate`` on Python 2.7.9 and higher, which will result in certificate validation errors against the Windows self-signed certificates. Unless verifiable certificates have been configured on the WinRM listeners, this should be set to ``ignore``.
 * ``ansible_winrm_kerberos_delegation``: Set to ``true`` to enable delegation of commands on the remote host when using kerberos.
+* ``ansible_winrm_operation_timeout_sec``: Increase the default timeout for WinRM operations (default: ``20``).
+* ``ansible_winrm_read_timeout_sec``: Increase the WinRM read timeout if you experience read timeout errors (default: ``30``), e.g. intermittent network issues.
 * ``ansible_winrm_*``: Any additional keyword arguments supported by ``winrm.Protocol`` may be provided.
 
 .. _windows_system_prep: