docs: remove some leftover terms from two manager readmes

lib/manager/ansible/readme.md

-Add configuration here if you want to enable or disable something in particular for Ansible files and override the default Docker settings.

lib/manager/pip_requirements/readme.md

-Add configuration here to specifically override settings for `pip` requirements files. Supports `requirements.txt` and `requirements.pip` files. The default file pattern is fairly flexible in an attempt to catch similarly named ones too but may be extended/changed.
+Supports `requirements.txt` and `requirements.pip` files. The default file pattern is fairly flexible in an attempt to catch similarly named ones too but may be extended/changed.