Improve comments and API for createLoadVisits helper

[acelaya]

Part of #7

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (7a7a181) 79.24% compared to head (8988112) 79.26%.

Files	Patch %	Lines
src/visits/reducers/common/createLoadVisits.ts	86.20%	0 Missing and 4 partials ⚠️
...c/visits/reducers/common/createVisitsAsyncThunk.ts	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   79.24%   79.26%   +0.02%     
==========================================
  Files         157      157              
  Lines        8981     8991      +10     
  Branches     1146     1146              
==========================================
+ Hits         7117     7127      +10     
  Misses        743      743              
  Partials     1121     1121              

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