Add 'exists' to win_stat return docs (#25146)

* Add 'exists' to win_stat return docs

Fix 25107 by adding documentation for 'exists' return value in win_stat module

* Added missing filename attribute to RETURN

Also made the path and filename sample values consistent.

lib/ansible/modules/windows/win_stat.py

@@ -130,11 +130,21 @@ stat:
             returned: success, path exists
             type: float
             sample: 1477984205.15
+        exists:
+            description: if the path exists or not
+            returned: success
+            type: boolean
+            sample: True
         extension:
             description: the extension of the file at path
             returned: success, path exists, path is a file
             type: string
             sample: ".ps1"
+        filename:
+            description: the name of the file (without path)
+            returned: success, path exists, path is a file
+            type: string
+            sammple: foo.ini
         isarchive:
             description: if the path is ready for archiving or not
             returned: success, path exists
@@ -192,9 +202,9 @@ stat:
             sample: BUILTIN\Administrators
         path:
             description: the full absolute path to the file
-            returned: success, path exists
+            returned: success, path exists, file exists
             type: string
-            sample: BUILTIN\Administrators
+            sample: C:\foo.ini
         sharename:
             description: the name of share if folder is shared
             returned: success, path exists, file is a directory and isshared == True