remove experimental warning from become/runas (#32604)

* updated docs/changelog accordingly

CHANGELOG.md

@@ -82,6 +82,7 @@ Ansible Changes By Release
   - TODO: build upon this to add many features detailed in ansible-config proposal https://github.com/ansible/proposals/issues/35
 * Windows modules now support the use of multiple shared module_utils files in the form of Powershell modules (.psm1), via `#Requires -Module Ansible.ModuleUtils.Whatever.psm1`
 * Python module argument_spec now supports custom validation logic by accepting a callable as the `type` argument.
+* Windows become_method: runas is no longer marked `experimental`
 * Windows become_method: runas now works across all authtypes and will auto-elevate under UAC if WinRM user has "Act as part of the operating system" privilege
 
 ### Deprecations

docs/docsite/rst/become.rst

@@ -217,10 +217,7 @@ delegation or accessing forbidden system calls like the WUA API. You can use
 ``become`` with the same user as ``ansible_user`` to bypass these limitations
 and run commands that are not normally accessible in a WinRM session.
 
-.. note:: While become support was added for Windows starting with Ansible 
-    version 2.3, this functionality is still considered experimental and can 
-    change in the future based on issues and limitations that are found. Prior to 
-    Ansible 2.4, become would only work when ``ansible_winrm_transport`` was 
+.. note:: Prior to Ansible 2.4, become would only work when ``ansible_winrm_transport`` was
     set to either ``basic`` or ``credssp``, but since Ansible 2.4 become now works on 
     all transport types.
 

lib/ansible/playbook/play_context.py

@@ -585,8 +585,6 @@ class PlayContext(Base):
 
             elif self.become_method == 'runas':
                 # become is handled inside the WinRM connection plugin
-                display.warning("The Windows 'runas' become method is experimental, and may change significantly in future Ansible releases.")
-
                 if not self.become_user:
                     raise AnsibleError(("The 'runas' become method requires a username "
                                         "(specify with the '--become-user' CLI arg, the 'become_user' keyword, or the 'ansible_become_user' variable)"))