Improve wording in playbooks_intro.rst

I was reading the docs and thought "that wording seems off."

docsite/rst/playbooks_intro.rst

@@ -151,7 +151,7 @@ Just `Control-C` to kill it and run it again with `-K`.
    These are deleted immediately after the command is executed.  This
    only occurs when sudoing from a user like 'bob' to 'timmy', not
    when going from 'bob' to 'root', or logging in directly as 'bob' or
-   'root'.  If this concerns you that this data is briefly readable
+   'root'.  If it concerns you that this data is briefly readable
    (not writable), avoid transferring uncrypted passwords with
    `sudo_user` set.  In other cases, '/tmp' is not used and this does
    not come into play. Ansible also takes care to not log password