Simon/differences robust ecdsa doc

[SimonRastikian]

This PR adds a section to the documentation that declares the differences between our spec and the original scheme.
A couple of additional small typos are repaired in the previous sections.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.12%. Comparing base (e67c26c) to head (9d43933).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   88.12%   88.12%           
=======================================
  Files          39       39           
  Lines        7888     7888           
  Branches     7888     7888           
=======================================
  Hits         6951     6951           
  Misses        393      393           
  Partials      544      544           

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[gilcu3]

I think the rebase did not work here @SimonRastikian . If I remember correctly, this was a PR with a small addition, now it looks like it is modifying a lot of files

[netrome]

Yeah seems like this should be rebased on latest main. Not sure why the robust-ecdsa-doc branch was merged into this one 9d43933