Update DOCKER.md

[GilMich]

added a little refinement to the installation guide as requested

[atalyaalon]

@GilMich are you sure that given WSL you need to install Docker on Windows?

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.89%. Comparing base (c0242b4) to head (ececb6e).
Report is 256 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2559      +/-   ##
==========================================
- Coverage   53.00%   52.89%   -0.12%     
==========================================
  Files         119      122       +3     
  Lines        9804    10147     +343     
==========================================
+ Hits         5197     5367     +170     
- Misses       4607     4780     +173     

Flag	Coverage Δ
unittests	52.89% <ø> (-0.12%)	⬇️

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