Reword the Molecule scenario comments

They were hard-wrapped at 80 characters, broke mid-parenthesis, and spent lines
restating what the code below them does.

Rewrapped at natural boundaries instead, with the narration dropped and only the
reasons, gotchas and surprises kept. Section dividers stay - they delineate long
plays rather than narrate them.

Comments only; no scenario behaviour changes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT

molecule-shared/requirements.yml

@@ -1,7 +1,5 @@
 ---
-# Shared by every role scenario under roles/custom/*/molecule/, referenced from
-# each scenario's molecule.yml. Kept in one place so the pins cannot drift
-# apart across roles.
+# Shared by every role scenario, so the pins cannot drift apart across roles.
 roles:
   - name: ansible-role-docker
     src: https://github.com/geerlingguy/ansible-role-docker