config: addopt current file formatting as yml & markdown parametrization

Cherry picked from #5564: e9f7dff

Author: davorpa

Diff for: .editorconfig

@@ -9,5 +9,8 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.md]
+[*.{markdown,md}]
 trim_trailing_whitespace = false
+
+[*.{yaml,yml}]
+indent_size = 2