Add Error Handling Docs to FHIR Search API

[alexanderkiel]

Closes: #3397

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.96%. Comparing base (dd62579) to head (eacdc14).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3398      +/-   ##
==========================================
- Coverage   95.98%   95.96%   -0.02%     
==========================================
  Files         403      403              
  Lines       25225    25225              
  Branches      646      645       -1     
==========================================
- Hits        24211    24208       -3     
- Misses        489      490       +1     
- Partials      525      527       +2     

see 2 files with indirect coverage changes

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