win_lineinfile backrefs bug fix and updated examples. (#20926)

* Bug Fix for win_lineinfile and updated examples.

- changed $backrefs to a bool so it works with true/false/yes/no. This also fixes idempotency.
- Updated Docs with an example of using backrefs.

* Made suggested updates and converted two more parameters to "bool"

* Updated the Exception message

- Now contains the Windows Exception message as well as a custom message to help point in the right direction of a failed write.

* Updated Exception Handling

- Added Exception checks for Creating and removing the temporary files.
- Changed the ErrorAction on the copy tmpfile and remove tmp file to "Stop" to
  cause the exception handler to catch all errors so we can fail gracefully
  every time.

lib/ansible/modules/windows/win_lineinfile.py

@@ -147,4 +147,11 @@ EXAMPLES = r'''
     path: C:\temp\testfile.txt
     line: Line added to file
     newline: unix
+
+# Update a line using backrefs
+- win_lineinfile:
+    path: C:\temp\example.conf
+    backrefs: yes
+    regexp: '(^name=)'
+    line: '$1JohnDoe'
 '''