Update migrate_to_109.rst

Author: eunwoo1104

docs/migrate_to_109.rst

@@ -9,15 +9,16 @@ This page will show how to deal with those changes.
 SlashContext
 ************
 
-.send()
--------
+.send() / .delete() / .edit()
+-----------------------------
 
 Before:
 
 .. code-block:: python
 
     # Case 1
     await ctx.send(4, content="Hello, World! This is initial message.")
+    await ctx.edit(content="Or nevermind.")
     await ctx.delete()
     await ctx.send(content="This is followup message.")
 
@@ -31,9 +32,31 @@ After:
     # Case 1
     await ctx.respond()
     msg = await ctx.send("Hello, World! This is initial message.")
+    await msg.edit(content="Or nevermind.")
     await msg.delete()
     await ctx.send("This is followup message.")
 
     # Case 2
     await ctx.respond(eat=True)
     await ctx.send("This is secret message.", hidden=True)
+
+Objects of the command invoke
+-----------------------------
+
+Before:
+
+.. code-block:: python
+
+    author_id = ctx.author.id if isinstance(ctx.author, discord.Member) else ctx.author
+    channel_id = ctx.channel.id if isinstance(ctx.channel, discord.TextChannel) else ctx.channel
+    guild_id = ctx.guild.id if isinstance(ctx.guild, discord.Guild) else ctx.guild
+    ...
+
+After:
+
+.. code-block:: python
+
+    author_id = ctx.author_id
+    channel_id = ctx.channel_id
+    guild_id = ctx.guild_id
+    ...