docs: permission overwrite methods descriptions (#5079)
docs: permission overwrite methods descriptions (#5079)

* Change permission overwrite methods descriptions

The methods `GuildChannel#updateOverwrite` and `#createOverwrite` had some awkward wording in the description: `. (...)` does not look good.  This PR cleans up the descriptions to be one sentence that's clearer in meaning.  There's also changes to make `permission overwrite/s` consistent - some lines had `permissions overwrite/s`.

* Update src/structures/GuildChannel.js

Co-authored-by: SpaceEEC <8fab3a84635be30879c9e37507df532964d633c1@yahoo.com>

* Update src/structures/GuildChannel.js

Co-authored-by: Sugden <c4726f5ea06513aabb91e54c20738fe8d84e2bea@users.noreply.github.com>

* Update src/structures/GuildChannel.js

Co-authored-by: Sugden <c4726f5ea06513aabb91e54c20738fe8d84e2bea@users.noreply.github.com>

Co-authored-by: SpaceEEC <8fab3a84635be30879c9e37507df532964d633c1@yahoo.com>
Co-authored-by: Sugden <c4726f5ea06513aabb91e54c20738fe8d84e2bea@users.noreply.github.com>
SpaceEEC/discord.js,SpaceEEC/discord.js,SpaceEEC/discord.js