Put umask value in quotation marks (#41409)

The given example causes the pip module to fail. If the umask is given as an octal string without quotation marks, the pip module converts it into an integer (i.e., an invalid umask). 

+label: docsite_pr

lib/ansible/modules/packaging/language/pip.py

@@ -186,7 +186,7 @@ EXAMPLES = '''
 # Install (Bottle) while ensuring the umask is 0022 (to ensure other users can use it)
 - pip:
     name: bottle
-    umask: 0022
+    umask: "0022"
   become: True
 '''