Auto merge of #15266 - tetsuharuohzeki:cleanup-editor-config, r=lnicola

Set .editorconfig default indent size to `4`

We uses `indent_size = 4` for almost files in this repository. This sorts the config to it.

Author: bors

.editorconfig

@@ -7,13 +7,10 @@ trim_trailing_whitespace = true
 end_of_line = lf
 insert_final_newline = true
 indent_style = space
-
-[*.{rs,toml}]
 indent_size = 4
 
-[*.ts]
-indent_size = 4
-[*.js]
-indent_size = 4
-[*.json]
-indent_size = 4
+[*.md]
+indent_size = 2
+
+[*.{yml, yaml}]
+indent_size = 2