Do not document buggy behavior. (#49325)

In the pip module, umask should be specified as an octal *string*, not an octal (or decimal) *integer*.

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

@@ -101,9 +101,6 @@ options:
         restrictive umask by default (e.g., "0077") and you want to pip install
         packages which are to be used by all users. Note that this requires you
         to specify desired umask mode as an octal string, (e.g., "0022").
-        Specifying the mode as a decimal integer (e.g., 22) will also work, but
-        an octal integer (e.g., 0022) will be converted to decimal (18) before
-        evaluation, which is almost certainly not what was intended.
     version_added: "2.1"
 notes:
    - Please note that virtualenv (U(http://www.virtualenv.org/)) must be