Added some comments to the various loincupload.properties for v2.73

[KevinDougan]

Closes #4000

Added some comments to the various loincupload.properties files to clarify that the Hierarchy filename was changed for v2.73.

[KevinDougan]

@jmarchionatto
I thought I should at least provide some comments in the hapi-fhir codebase to indicate that the LOINC Hierarchy filename was changed in v2.73.
Could you please approve the addition of these comments in the hopes that it will clarify the situation as described in #4000 ?

[codecov]

Codecov Report

Base: 81.00% // Head: 81.30% // Increases project coverage by +0.29% 🎉

Coverage data is based on head (071c40e) compared to base (02944ba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4382      +/-   ##
============================================
+ Coverage     81.00%   81.30%   +0.29%     
- Complexity    23466    23526      +60     
============================================
  Files          1446     1418      -28     
  Lines         86175    86163      -12     
  Branches      11798    11680     -118     
============================================
+ Hits          69809    70057     +248     
+ Misses        11087    10921     -166     
+ Partials       5279     5185      -94     

Impacted Files	Coverage Δ
...validation/validator/VersionTypeAdvisorDstu21.java	0.00% <0.00%> (-100.00%)	⬇️
...ir/jpa/provider/r4/BaseResourceProviderR4Test.java	0.00% <0.00%> (-95.32%)	⬇️
...ir/jpa/api/dao/MetadataKeyCurrentlyReindexing.java	40.00% <0.00%> (-60.00%)	⬇️
ca/uhn/fhir/mdm/api/IMdmLink.java	42.85% <0.00%> (-28.58%)	⬇️
...uhn/fhir/jpa/term/config/TermCodeSystemConfig.java	75.00% <0.00%> (-25.00%)	⬇️
...bscription/channel/impl/LinkedBlockingChannel.java	72.72% <0.00%> (-17.28%)	⬇️
...model/entity/ResourceIndexedComboStringUnique.java	56.75% <0.00%> (-16.22%)	⬇️
...hir/rest/server/servlet/ServletRequestDetails.java	73.56% <0.00%> (-15.84%)	⬇️
ca/uhn/fhir/jpa/test/config/TestJPAConfig.java	87.50% <0.00%> (-12.50%)	⬇️
...a/uhn/fhir/jpa/partition/SystemRequestDetails.java	41.30% <0.00%> (-8.70%)	⬇️
... and 276 more

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