Added docstring for checks.py

Author: Taaku18

core/checks.py

@@ -1,11 +1,32 @@
 from discord.ext import commands
 
+
 def has_permissions(**perms):
-    """Check if the author has required permissions.
-    This will always return ``True`` if the author is a bot owner, or
-    has the ``administrator`` permission.
     """
+    A decorator that checks if the author has the required permissions.
+
+    Examples
+    --------
+        @has_permissions(administrator=True)
+        async def setup(ctx):
+            print("Success")
+    """
+
     async def predicate(ctx):
+        """
+        Parameters
+        ----------
+        ctx : Context
+            The current discord.py `Context`.
+
+        Returns
+        -------
+        True
+            If the author is a bot owner, or
+            has the ``administrator`` permission.
+            Or if the author has all of the required permissions.
+            Otherwise, `False`.
+        """
         if await ctx.bot.is_owner(ctx.author):
             return True
 
@@ -20,7 +41,23 @@ async def predicate(ctx):
 
 
 def thread_only():
-    """Checks if the command is being run in a modmail thread"""
+    """
+    A decorator that checks if the command
+    is being ran within a Modmail thread.
+    """
+
     async def predicate(ctx):
+        """
+        Parameters
+        ----------
+        ctx : Context
+            The current discord.py `Context`.
+
+        Returns
+        -------
+        True
+            if the current `Context` is within a Modmail thread.
+            Otherwise, `False`.
+        """
         return ctx.thread is not None
     return commands.check(predicate)