Typo: Updated the rails version in rails 7.2 release note [skip ci]

akhilgkrishnan · akhilgkrishnan · commit 6df831a5c6c2 · 2023-10-07T23:12:40.000+05:30
diff --git a/guides/source/7_2_release_notes.md b/guides/source/7_2_release_notes.md
@@ -7,7 +7,7 @@ Highlights in Rails 7.2:
 
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-Upgrading to Rails 7.1
+Upgrading to Rails 7.2
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 If you're upgrading an existing application, it's a great idea to have good test
