tooling: Fix .editorconfig rst indent setting from 3 to 4

This was initially done to have stuff like notes align nicely:

.. note::
   Three indents looks grand, doesn't it!

But it caused lots of issues with writing code blocks, so
this commit reverts that change back to use a tab size of 4.

If you want it to align with an indentation size of 4, you can
just do the following:

 .. note::
    With an initial space, it still looks grand and now
    this is four spaces indented which just works.

Author: cassava

.editorconfig

@@ -28,5 +28,5 @@ indent_size = 2
 trim_trailing_whitespace = true
 
 [*.rst]
-indent_size = 3
+indent_size = 4
 trim_trailing_whitespace = true