work_guard has license info.

[klemens-morgenstern]

Closes #2705 .

[codecov]

Codecov Report

Merging #2726 (d6c830e) into develop (ba25a11) will decrease coverage by 0.09%.
Report is 1 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2726      +/-   ##
===========================================
- Coverage    92.94%   92.85%   -0.09%     
===========================================
  Files          177      177              
  Lines        13658    13621      -37     
===========================================
- Hits         12694    12648      -46     
- Misses         964      973       +9     

Files Changed	Coverage Δ
include/boost/beast/core/detail/work_guard.hpp	100.00% <ø> (ø)

... and 24 files with indirect coverage changes

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