fix: Duplication in bridge command help

[Blue-Robin-Taken]

Summary

This pull request is for the issue #2306

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[Blue-Robin-Taken]

Just need to add docs and changelog

[solaluset]

This breaks the command if ext.bridge is not imported:

Ignoring exception in command help:
Traceback (most recent call last):
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/core.py", line 180, in wrapped
    ret = await coro(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/help.py", line 858, in command_callback
    return await self.send_bot_help(mapping)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/help.py", line 1074, in send_bot_help
    self.add_indented_commands(commands, heading=category, max_size=max_size)
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/help.py", line 1000, in add_indented_commands
    command, discord.ext.bridge.core.BridgeExtCommand
             ^^^^^^^^^^^^^^^^^^
AttributeError: module 'discord.ext' has no attribute 'bridge'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/bot.py", line 349, in invoke
    await ctx.command.invoke(ctx)
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/core.py", line 959, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/data/data/com.termux/files/home/tests/lib/python3.11/site-packages/discord/ext/commands/core.py", line 189, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: module 'discord.ext' has no attribute 'bridge'

[Blue-Robin-Taken]

oh frick

[Blue-Robin-Taken]

that uh

[Blue-Robin-Taken]

Ok Ima fix this