Improve docstring coverage across cogs

[Claude]

Several cogs had missing or malformed docstrings, reducing code discoverability and breaking Red-bot's help command generation.

Changes

Fixed incorrect docstring format:

• misc/misc.py: Converted single-quoted string to proper triple-quoted docstring

  # Before: "Misc things for your server" (not recognized by __doc__)
  # After:  """Misc things for your server."""

Added class-level docstrings:

• quotesdb/quotedb.py: Added comprehensive cog description
• empty_voices/api.py: Added cog description explaining automatic voice channel management

Added NumPy-style parameter documentation:

• empty_voices/api.py: Added Parameters sections to 4 helper methods (cleanup_temp_channels_config, try_delete_channel, validate_category, try_rename_channel)

  async def try_delete_channel(self, guild: discord.Guild, channel: discord.VoiceChannel, should_keep=False):
      """Check if this channel is empty, and delete it
  
      Parameters
      ----------
      guild : discord.Guild
          The guild containing the channel
      channel : discord.VoiceChannel
          The voice channel to check and potentially delete
      should_keep : bool, optional
          If True, skip deletion even if channel is empty (default: False)
      """

Notes

Modal/View classes in party/party.py, helper methods in secret_santa/secret_santa.py, and helper functions in albion_ava/ava.py already have proper docstrings.