Add comments and fix build

[sungam3r]

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[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (81c6697) 64.94% compared to head (ba98fe8) 64.40%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/HealthChecks.System/FileHealthCheck.cs	80.00%	4 Missing and 1 partial ⚠️
src/HealthChecks.System/DiskStorageOptions.cs	71.42%	4 Missing ⚠️
src/HealthChecks.System/FileHealthCheckOptions.cs	60.00%	4 Missing ⚠️
...ncyInjection/SystemHealthCheckBuilderExtensions.cs	87.50%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2114      +/-   ##
==========================================
- Coverage   64.94%   64.40%   -0.55%     
==========================================
  Files         262      248      -14     
  Lines        8496     8363     -133     
  Branches      600      585      -15     
==========================================
- Hits         5518     5386     -132     
- Misses       2828     2830       +2     
+ Partials      150      147       -3     

Flag	Coverage Δ
AzureBlobStorage	?
AzureEventHubs	?
AzureFileStorage	?
AzureQueueStorage	?
AzureTableStorage	?
Dapr	?
System	42.56% <76.92%> (+5.28%)	⬆️

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