update doc to reflect Celery 5.2.x (#7153)

* update doc to reflect Celery 5.2.x

* Mention 3.10 as well.

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>

* Fix formatting.

* update

Co-authored-by: Omer Katz <omer.katz@omerkatz.com>
Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>

docs/getting-started/introduction.rst

@@ -39,14 +39,15 @@ What do I need?
 ===============
 
 .. sidebar:: Version Requirements
-    :subtitle: Celery version 5.1 runs on
+    :subtitle: Celery version 5.2 runs on
 
-    - Python ❨3.6, 3.7, 3.8❩
-    - PyPy3.6 ❨7.3❩
+    - Python ❨3.7, 3.8, 3.9, 3.10❩
+    - PyPy3.7, 3.8 ❨7.3.7❩
 
     Celery 4.x was the last version to support Python 2.7,
     Celery 5.x requires Python 3.6 or newer.
     Celery 5.1.x also requires Python 3.6 or newer.
+    Celery 5.2.x requires Python 3.7 or newer.
 
 
     If you're running an older version of Python, you need to be running