Fix some small typos

[codingjoe]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.76%. Comparing base (a45643d) to head (5e29360).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files           5        5           
  Lines         134      134           
=======================================
  Hits          131      131           
  Misses          3        3           

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[Copilot]

Pull request overview

This PR addresses several typos and inconsistencies in the README.md documentation for the django-crontask project.

• Fixed a grammar issue by adding "on top of" to complete a sentence about APScheduler
• Corrected the spelling of "launch"
• Fixed incorrect command name references from "crontab" to "crontask" to match the actual Django management command

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