Typos discovered by codespell

[cclauss]

Summary

DIscovered in #6227

$ codespell --ignore-words-list="nd" --quiet-level=2

./discord/object.py:68: convertable ==> convertible
./discord/enums.py:247: noone ==> no one
./discord/guild.py:1317: Retreives ==> Retrieves
./discord/ext/commands/cooldowns.py:66: recieving ==> receiving
./discord/ext/commands/errors.py:377: convertable ==> convertible
./docs/api.rst:1936: noone ==> no one
./docs/locale/ja/LC_MESSAGES/intro.po:81: libaries ==> libraries
./docs/locale/ja/LC_MESSAGES/api.po:11075: Retreives ==> Retrieves
./docs/locale/ja/LC_MESSAGES/ext/commands/api.po:5549: convertable ==> convertible
./examples/custom_context.py:42: wasnt ==> wasn't
./examples/custom_context.py:45: shouldnt ==> shouldn't

Reproduction Steps

Expected Results

Actual Results

Intents

Checklist

• [ ] I have searched the open issues for duplicates.
• [ ] I have shown the entire traceback, if possible.
• [ ] I have removed my token from display, if visible.
• [ ] I have provided the intents that my bot is using.

System Information

[plun1331]

maybe just open a pr and fix it instead