Added documentation about merging blocks horizontally (Resolves #5836)

[iSparsh]

📑 Summary

• Added section about merging blocks horizontally by setting the column width to 1.
• Shown using an example of nested blocks.

Resolves #5836

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All modified and coverable lines are covered by tests ✅

Project coverage is 5.00%. Comparing base (a5559c6) to head (d50a6cf).
Report is 27 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5916   +/-   ##
=======================================
  Coverage     5.00%   5.00%           
=======================================
  Files          338     337    -1     
  Lines        48220   48209   -11     
  Branches       551     576   +25     
=======================================
  Hits          2413    2413           
+ Misses       45807   45796   -11     

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[PHHENS]

Dear developper,
I did not ask how to stack block vertically, but how to MERGE block vertically :
several block becoming one.
+----+ +----+
| | | |
| | +----+
| | +----+
| | | |
+----+ +----+

Thanks.

[iSparsh]

@PHHENS sorry, I'm not sure what you mean by that. I'm pretty sure you can use the nested blocks to "merge" blocks (so that they act as one block) as is shown in the first example on here. You can make it vertical by the documentation I have added. Please let me know if I am misunderstanding you! It would be helpful if you could post a diagram of what you want to accomplish through images.

[PHHENS]

Sorry for the bad ascii schematic (some spaces disappeared). Find here an schematic :

Thanks for your interest and help.