Fixed a typo in message for lintr_line_length_linter

[marberts]

The lintr_line_length_linter check had a small typo in the message: "Try make your lines shorter than 80 characters" -> "Try making your lines shorter than 80 characters".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.45%. Comparing base (4a4c771) to head (864d494).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #183   +/-   ##
=======================================
  Coverage   50.45%   50.45%           
=======================================
  Files          10       10           
  Lines         220      220           
=======================================
  Hits          111      111           
  Misses        109      109           

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[mpadge]

@marberts Thanks for helping to improve this package; much appreciated!