Reformat Pcap++ documentation to use triple-slash doxygen format.

[Dimi1010]

Part of #1658
Includes reformatting of classes, structs and namespace documentation.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.15%. Comparing base (7898a5d) to head (d07bf3d).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
Pcap++/header/PcapRemoteDevice.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1660      +/-   ##
==========================================
- Coverage   83.16%   83.15%   -0.02%     
==========================================
  Files         277      277              
  Lines       48201    48193       -8     
  Branches     9932     9969      +37     
==========================================
- Hits        40086    40073      -13     
+ Misses       7266     7244      -22     
- Partials      849      876      +27     

Flag	Coverage Δ
alpine320	75.16% <80.00%> (+<0.01%)	⬆️
fedora40	75.20% <80.00%> (+0.02%)	⬆️
macos-13	80.65% <71.42%> (-0.01%)	⬇️
macos-14	80.65% <71.42%> (-0.01%)	⬇️
macos-15	80.62% <71.42%> (-0.01%)	⬇️
mingw32	70.89% <66.66%> (-0.03%)	⬇️
mingw64	70.84% <66.66%> (-0.05%)	⬇️
npcap	85.30% <83.33%> (-0.02%)	⬇️
rhel94	75.02% <80.00%> (-0.01%)	⬇️
ubuntu2004	58.60% <80.00%> (-0.03%)	⬇️
ubuntu2004-zstd	58.74% <80.00%> (+0.01%)	⬆️
ubuntu2204	74.97% <80.00%> (+<0.01%)	⬆️
ubuntu2204-icpx	61.40% <57.14%> (-0.04%)	⬇️
ubuntu2404	75.22% <80.00%> (+<0.01%)	⬆️
unittest	83.15% <87.50%> (-0.02%)	⬇️
windows-2019	85.33% <83.33%> (-0.02%)	⬇️
windows-2022	85.36% <83.33%> (-0.02%)	⬇️
winpcap	85.32% <83.33%> (-0.01%)	⬇️
xdp	50.54% <20.00%> (+<0.01%)	⬆️

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[tigercosmos]

LGTM