Update 00_SIGNALduino.pm - commandref

[HomeAutoUser]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)
• CHANGED has been updated (needed for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  docs update

• What is the current behavior? (You can also link to an open issue here)
  documentation incomplete & typographical error

• What is the new behavior (if this is a feature change)?
  documentation revised

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Other information:

[codecov]

Codecov Report

Merging #912 (553db42) into master (35fc576) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #912      +/-   ##
==========================================
- Coverage   54.16%   54.11%   -0.06%     
==========================================
  Files          62       62              
  Lines        7988     7988              
  Branches     1285     1285              
==========================================
- Hits         4327     4323       -4     
- Misses       2860     2864       +4     
  Partials      801      801              

Flag	Coverage Δ
fhem	91.37% <ø> (ø)
modules	91.37% <ø> (ø)
perl	91.37% <ø> (ø)
unittest	54.11% <ø> (-0.06%)	⬇️
unittests	91.37% <ø> (ø)

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Impacted Files	Coverage Δ
FHEM/00_SIGNALduino.pm	60.85% <ø> (-0.22%)	⬇️

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