feat(seautils): added a detailed docstring to the rfc command

seautils/seautils.py

@@ -201,7 +201,18 @@ class SeaUtils(commands.Cog):
 
     @commands.command()
     async def rfc(self, ctx: commands.Context, number: int) -> None:
-        """Retrieve the text of an RFC document."""
+        """Retrieve the text of an RFC document.
+
+        This command uses the [RFC Editor website](https://www.rfc-editor.org/) to fetch the text of an RFC document.
+        `number` refers to the number of the RFC document you wish to retrieve.
+        Modified excerpt from the RFC Editor website:
+        >>> The RFC Series (ISSN 2070-1721) contains technical and organizational documents about the Internet,
+        including the specifications and policy documents produced by five streams:
+        - [Internet Engineering Task Force](https://www.ietf.org/)
+        - [Internet Research Task Force](https://www.irtf.org/)
+        - [Internet Architecture Board](https://www.iab.org/)
+        - [Independent Submissions](https://www.rfc-editor.org/independent)
+        - [Editorial](https://www.rfc-editor.org/info/rfc9280)"""
         url = f"https://www.rfc-editor.org/rfc/rfc{number}.html"
         async with aiohttp.ClientSession() as session:
             async with session.get(url=url) as response: