Fix typos in quirk tooltips

[SJuliez]

Fixes MegaMek/megameklab#2005

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.86%. Comparing base (06fcaab) to head (1e8cf54).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8008      +/-   ##
============================================
- Coverage     29.89%   29.86%   -0.04%     
+ Complexity    16928    16897      -31     
============================================
  Files          3144     3144              
  Lines        303517   303517              
  Branches      53035    53035              
============================================
- Hits          90747    90640     -107     
- Misses       203330   203477     +147     
+ Partials       9440     9400      -40     

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[Copilot]

Pull request overview

This PR updates option tooltip strings for unit/weapon quirks to correct typos and improve wording in the shared messages.properties resource bundle (referenced by MegaMek’s options/quirks UI).

Changes:

• Fix grammar/capitalization in the “Rugged” quirk descriptions (and wrap the long lines using properties continuations).
• Fix possessive typo in the “Exposed Weapon Linkage” description (“it’s” → “its”).

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