🐛 Fixed api endpoint for guild member role actions

[kylianpl]

Changes

• fixed: api endpoint for add_guild_member_role and remove_guild_member_role

Check off the following

• I have tested my changes with the current requirements
• My Code follows the pep8 code style.

[codecov]

Codecov Report

Merging #426 (907a8d8) into main (b33ef32) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #426   +/-   ##
=======================================
  Coverage   91.17%   91.17%           
=======================================
  Files           9        9           
  Lines         102      102           
=======================================
  Hits           93       93           
  Misses          9        9           

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[Arthurdw]

Matches the discord docs.