Spotted some old prints in the documentation.

[JulienPalard]

Was reading the doc, spotted some Python 2 print, grepped for more while I'm at it.

[guedou]

Thanks for your PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.86%. Comparing base (13621d1) to head (9607c71).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4862      +/-   ##
==========================================
- Coverage   80.86%   80.86%   -0.01%     
==========================================
  Files         368      368              
  Lines       90255    90255              
==========================================
- Hits        72989    72983       -6     
- Misses      17266    17272       +6     

Files with missing lines	Coverage Δ
scapy/contrib/ppi_geotag.py	95.48% <ø> (ø)
scapy/layers/dot15d4.py	79.56% <ø> (ø)
scapy/layers/sctp.py	95.81% <ø> (ø)

... and 10 files with indirect coverage changes

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