Merge pull request rails#53947 from sikachu/suffix-guide-h2-number-with-dot

Add dot suffix to headings in guides

Author: kamipo

guides/rails_guides/markdown.rb

@@ -186,15 +186,15 @@ def node_index(hierarchy)
         case hierarchy.size
         when 1
           @index_counter[2] = @index_counter[3] = @index_counter[4] = 0
-          "#{@index_counter[1] += 1}"
+          "#{@index_counter[1] += 1}."
         when 2
           @index_counter[3] = @index_counter[4] = 0
-          "#{@index_counter[1]}.#{@index_counter[2] += 1}"
+          "#{@index_counter[1]}.#{@index_counter[2] += 1}."
         when 3
           @index_counter[4] = 0
-          "#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3] += 1}"
+          "#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3] += 1}."
         when 4
-          "#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3]}.#{@index_counter[4] += 1}"
+          "#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3]}.#{@index_counter[4] += 1}."
         end
       end