fix grammar (#446)

twitchio/ext/commands/bot.py

@@ -347,7 +347,7 @@ async def invoke(self, context):
         await context.command(context)
 
     def load_module(self, name: str) -> None:
-        """Method which loads a module and it's cogs.
+        """Method which loads a module and its cogs.
 
         Parameters
         ------------
@@ -367,7 +367,7 @@ def load_module(self, name: str) -> None:
         self._modules[name] = module
 
     def unload_module(self, name: str) -> None:
-        """Method which unloads a module and it's cogs.
+        """Method which unloads a module and its cogs.
 
         Parameters
         ----------
@@ -402,7 +402,7 @@ def unload_module(self, name: str) -> None:
                 del sys.modules[m]
 
     def reload_module(self, name: str):
-        """Method which reloads a module and it's cogs.
+        """Method which reloads a module and its cogs.
 
         Parameters
         ----------