Fix a/an grammar in camops personnel market notification

[Algebro7]

This fixes the grammar in the CamOps personnel market notification to use "An" for the exp levels starting with a vowel and "A" for the others.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.46%. Comparing base (415ecaf) to head (10db9fc).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4977      +/-   ##
============================================
- Coverage     10.47%   10.46%   -0.02%     
+ Complexity     6021     6016       -5     
============================================
  Files           951      951              
  Lines        133248   133320      +72     
  Branches      19377    19379       +2     
============================================
- Hits          13961    13953       -8     
- Misses       117940   118018      +78     
- Partials       1347     1349       +2     

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