Update README.md

[Vicbi]

Name of the PR

Update text in the Example description

♻️ Current situation & Problem

The Example in the READMe file provides an example on how to convert HealthKit heart rate samples into FHIR observations. The text originally stated "step count data". The description was updated to replace "step count" with "heart rate".

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.86%. Comparing base (54d06c3) to head (018a837).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          23       23           
  Lines        1092     1092           
=======================================
  Hits         1014     1014           
  Misses         78       78           

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