Merge pull request #22739 from akshay-vishnoi/fix-docs

[ci skip] Fix typo

guides/rails_guides/markdown/renderer.rb

@@ -16,7 +16,7 @@ def block_code(code, language)
       end
 
       def header(text, header_level)
-        # Always increase the heading level by, so we can use h1, h2 heading in the document
+        # Always increase the heading level by 1, so we can use h1, h2 heading in the document
         header_level += 1
 
         %(<h#{header_level}>#{text}</h#{header_level}>)