Docs: move formats to top level in RTD config (#4718)

Author: RishabhJain2018

.readthedocs.yaml

@@ -1,7 +1,7 @@
 version: 2
 
 build:
-  os: ubuntu-22.04 # required since Oct 2023
+  os: ubuntu-22.04
   tools:
     python: "3.11"
 
@@ -11,7 +11,7 @@ python:
 
 sphinx:
   configuration: docs/source/conf.py
-  builder: html
-  formats:
-    - epub
-    - pdf
+
+formats:
+  - epub
+  - pdf