Apply suggestions from code review

Co-authored-by: Colin Dean <[email protected]>

Formula/p/python@3.12.rb

@@ -402,13 +402,14 @@ def post_install
  python -m pip install xyz
 
  If you wish to install a non-brew packaged Python application,
- it may be easiest to use pipx install xyz, which will manage a
+ it may be easiest to use 'pipx install xyz', which will manage a
  virtual environment for you. You can install pipx with
- brew install pipx.
+
+ brew install pipx
 
  Expert users may restore the old behavior of pip by passing
- the --break-system-packages flag to pip, or by adding
- break-system-packages = true to their pip.conf file. The latter
+ the '--break-system-packages' flag to pip, or by adding
+ 'break-system-packages = true' to their pip.conf file. The latter
  will permanently disable this warning.
 
  Read more about this setting here: <https://pip.pypa.io/en/stable/cli/pip_install/>