Clarify the license statement for examples/

[mhucka]

The statement about everyone being free to copy, publish, etc., was ambiguous; after discussion with @Dstrain, we settled on adding mention of the Apache license.

While I was at it, I got rid of my previous hacky solution for formatting the note, in favor of using GFM's simple markup for info boxes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (4bdf21f) to head (7f8a782).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7173      +/-   ##
==========================================
- Coverage   98.13%   98.13%   -0.01%     
==========================================
  Files        1095     1095              
  Lines       95649    95649              
==========================================
- Hits        93867    93866       -1     
- Misses       1782     1783       +1     

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[pavoljuhas]

LGTM with a fixed URL