Replace "reference" with "demo" in PR Template

[omarismail94]

Nit fix. Since folder is called demo now, replaced mention of reference with demo

[vvikramraj]

Now that you have triggered my OCD, can you please also add full stops to these sentences? :)

[omarismail94]

@vvikramraj fixed!

[codecov]

Codecov Report

Merging #1207 (1cb1e36) into master (27cfe1f) will decrease coverage by 0.04%.
The diff coverage is 68.46%.

@@             Coverage Diff              @@
##             master    #1207      +/-   ##
============================================
- Coverage     84.57%   84.53%   -0.05%     
- Complexity      632      646      +14     
============================================
  Files           135      140       +5     
  Lines         10407    10488      +81     
  Branches        787      795       +8     
============================================
+ Hits           8802     8866      +64     
- Misses         1209     1223      +14     
- Partials        396      399       +3     

Impacted Files	Coverage Δ
...ava/com/google/android/fhir/impl/FhirEngineImpl.kt	42.00% <24.13%> (-31.34%)	⬇️
...oid/fhir/sync/bundle/TransactionBundleGenerator.kt	77.27% <77.27%> (ø)
.../google/android/fhir/sync/bundle/BundleUploader.kt	77.77% <77.77%> (ø)
...a/com/google/android/fhir/sync/FhirSynchronizer.kt	81.57% <80.00%> (+14.54%)	⬆️
...ndle/HttpVerbBasedBundleEntryComponentGenerator.kt	90.90% <90.90%> (ø)
...android/fhir/db/impl/entities/LocalChangeEntity.kt	100.00% <100.00%> (ø)
...main/java/com/google/android/fhir/sync/Uploader.kt	100.00% <100.00%> (ø)
...ttpVerbBasedBundleEntryComponentImplementations.kt	100.00% <100.00%> (ø)

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