Add docs on RANGE_TO_UNTIL rule

[petertrr]

What's done:

• Add docs

This pull request closes #1333

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v1)

1 932 tests   1 917 ✔️  3m 0s ⏱️
   160 suites       15 💤
   160 files           0 ❌

Results for commit a1212d5.

[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v1)

1 917 tests   1 902 ✔️  1m 27s ⏱️
   159 suites       15 💤
   159 files           0 ❌

Results for commit a1212d5.

[codecov]

Codecov Report

Merging #1525 (a1212d5) into master (1756fc3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1525   +/-   ##
=========================================
  Coverage     82.61%   82.61%           
  Complexity     2565     2565           
=========================================
  Files           111      111           
  Lines          7712     7712           
  Branches       2117     2117           
=========================================
  Hits           6371     6371           
  Misses          442      442           
  Partials        899      899           

Flag	Coverage Δ
unittests	82.61% <ø> (ø)

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