fix: typos in documentation files

[leopardracer]

This pull request contains changes to improve clarity, correctness and structure.

Description correction:
Corrected "needs an unique" to "needs a unique".
Corrected "If there is not" to "If there is no".

Please review the changes and let me know if any additional changes are needed.

[conradoplg]

All dkg.md are generated from the frost-ristretto255 one. Would you mind updating them all?

[leopardracer]

@conradoplg I checked for typos and corrected them where it was possible.

[leopardracer]

@conradoplg Hi! Apologies for the inconvenience. I just wanted to check if there’s anything I can improve in my pull request. Please feel free to ask any questions or let me know if any changes are needed to meet the project's merge requirements. I’m happy to make adjustments!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.71%. Comparing base (5f4ac6e) to head (9e8990f).
Report is 63 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
- Coverage   82.18%   81.71%   -0.47%     
==========================================
  Files          31       34       +3     
  Lines        3188     3331     +143     
==========================================
+ Hits         2620     2722     +102     
- Misses        568      609      +41     

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[mpguerra]

@conradoplg Hi! Apologies for the inconvenience. I just wanted to check if there’s anything I can improve in my pull request. Please feel free to ask any questions or let me know if any changes are needed to meet the project's merge requirements. I’m happy to make adjustments!

All good, thank you for your contribution!