Update migrate_to_109.rst

Author: eunwoo1104

docs/migrate_to_109.rst

@@ -6,22 +6,34 @@ However, due to that, it includes many critical breaking changes.
 
 This page will show how to deal with those changes.
 
-SlashContext.send()
-********************
+SlashContext
+************
+
+.send()
+-------
 
 Before:
 
 .. code-block:: python
 
+    # Case 1
     await ctx.send(4, content="Hello, World! This is initial message.")
     await ctx.delete()
     await ctx.send(content="This is followup message.")
 
+    # Case 2
+    await ctx.send(content="This is secret message.", complete_hidden=True)
+
 After:
 
 .. code-block:: python
 
-    await ctx.respond(eat=False)
+    # Case 1
+    await ctx.respond()
     msg = await ctx.send("Hello, World! This is initial message.")
     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)