Fix smells in submission init file.

cogs/submission/__init__.py

@@ -1,6 +1,4 @@
-"""
-Cog for creating submission process.
-"""
+"""Cog for creating submission process."""
 
 from nextcord.ext import commands
 
@@ -15,14 +13,14 @@ class SubmissionCog(commands.Cog, name="Submission Cog"):
         self.bot = bot
 
     @commands.Cog.listener()
-    async def on_ready(self):
-        """Called when cog is loaded"""
+    async def on_ready(self) -> None:
+        """Called when cog is loaded."""
         self.bot.add_view(SubmissionCreateButton(self.bot))
         self.bot.add_view(VerificationView())
 
 
 # This function will be called when this extension is loaded.
 # It is necessary to add these functions to the bot.
-def setup(bot: commands.Bot):
-    """Adds function to bot"""
+def setup(bot: commands.Bot) -> None:
+    """Adds function to bot."""
     bot.add_cog(SubmissionCog(bot))