Fix typo in update command

Author: martinbndr

cogs/utility.py

@@ -2197,7 +2197,7 @@ async def update(self, ctx, *, flag: str = ""):
                 if self.bot.check_local_git() is False:
                     embed = discord.Embed(
                         title="Update Command Unavailable",
-                        description="The bot cannot be updated due to not being installed via a git."
+                        description="The bot cannot be updated due to not being installed via git."
                         "You need to manually update the bot according to your hosting method."
                         "If you face any issues please don´t hesitate to contact modmail support.",
                         color=discord.Color.red(),