(Basic Enumerable Methods) Chore: Fix Markdownlint Errors (#28703)

ruby/basic_ruby/basic_enumerable_methods.md

@@ -116,6 +116,7 @@ my_hash.each { |key, value| puts "#{key} is #{value}" }
 #=> two is 2
 #=> { "one" => 1, "two" => 2}
 ```
+
 ```ruby
 my_hash.each { |pair| puts "the pair is #{pair}" }