Merge pull request rails#52585 from Shopify/fix-docs-linting

Fix linting error in Caching With Rails doc

Author: rafaelfranca

guides/source/caching_with_rails.md

@@ -720,6 +720,7 @@ response.strong_etag = response.body # => "618bbc92e2d35ea1945008b42799b0e7"
 
 Caching in Development
 ----------------------
+
 By default, caching is *enabled* in development mode with
 [`:memory_store`](#activesupport-cache-memorystore).