Fix copyright on TorchRec webpage (meta-pytorch#3175)

Summary:
Pull Request resolved: meta-pytorch#3175

As per OSS team, the copyright should be this format https://www.internalfb.com/wiki/Open_Source/Launch_an_OSS_Project/Launch_Preparation/Automated_Checkup/Terms_Of_Use_&_Privacy_Policy/

Reviewed By: bigfootjon

Differential Revision: D78010324

fbshipit-source-id: 43280eccbc747d1a026f6f26f2eb0703f095d8c1

Author: kausv

docs/source/conf.py

@@ -30,7 +30,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "TorchRec"
-copyright = "2024, Meta"
+copyright = "Meta Platforms, Inc"
 author = "Meta"
 
 try: