Very small improvments in documentation syntax and title

[gbossert]

No description provided.

[codecov-io]

Codecov Report

Merging #160 into next will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             next     #160      +/-   ##
==========================================
- Coverage   66.19%   66.18%   -0.01%     
==========================================
  Files         170      170              
  Lines       10363    10363              
==========================================
- Hits         6860     6859       -1     
- Misses       3503     3504       +1

Impacted Files	Coverage Δ
netzob/src/netzob/Model/Vocabulary/Types/IPv4.py	88% <0%> (-1%)	⬇️

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[gbossert]

thank you @otetard