Update docs on command invocation

[daun]

• Commands no longer run in the statamic namespace
• php please → php artisan

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.40%. Comparing base (63a810a) to head (8ff4b89).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #92   +/-   ##
=========================================
  Coverage     62.40%   62.40%           
  Complexity      829      829           
=========================================
  Files            68       68           
  Lines          2825     2825           
=========================================
  Hits           1763     1763           
  Misses         1062     1062           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.