substitute "sample" with "peak"

[jmborr]

Simply substitute the concept of sample with peak, in the context of multiple intensity peaks in a given run. For instance, when multiple samples are present in a given experiment and the samples scatter at different angles, more than one
intensity peak is observed

Description of work:

Check all that apply:

• release notes not needed
• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests

References:

• Links to IBM EWM items: 7592 (parent 5896)

Manual test for the reviewer

(Instructions for testing here)

Check list for the reviewer

• release notes
  updated, or an explanation is provided as to why release notes are unnecessary
• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.63473% with 29 lines in your changes missing coverage. Please review.

Project coverage is 75.41%. Comparing base (bc09361) to head (00263ff).
Report is 3 commits behind head on next.

Files with missing lines	Patch %	Lines
src/mr_reduction/peak_finding.py	35.13%	24 Missing ⚠️
src/mr_reduction/runpeak.py	94.00%	3 Missing ⚠️
src/mr_reduction/reflectivity_merge.py	95.65%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             next      #17   +/-   ##
=======================================
  Coverage   75.41%   75.41%           
=======================================
  Files          18       18           
  Lines        2209     2209           
=======================================
  Hits         1666     1666           
  Misses        543      543           

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