update doc

Author: Lumabots

discord/ext/commands/converter.py

@@ -852,7 +852,8 @@ async def convert(self, ctx: Context, argument: str) -> discord.GuildEmoji:
 class PartialEmojiConverter(Converter[discord.PartialEmoji]):
     """Converts to a :class:`~discord.PartialEmoji`.
 
-    This is done by extracting the animated flag, name and ID from the emoji.
+    This is done by extracting the animated flag, name, and ID for custom emojis,
+    or by using the standard Unicode emojis supported by Discord.
 
     .. versionchanged:: 1.5
          Raise :exc:`.PartialEmojiConversionFailure` instead of generic :exc:`.BadArgument`