Add padding for code blocks in the editor help

This improves their appearance, making them look closer to code blocks
in the online manual.

editor/editor_help.cpp

@@ -1844,6 +1844,7 @@ static void _add_text_to_rt(const String &p_bbcode, RichTextLabel *p_rt) {
 			p_rt->push_table(1);
 			p_rt->push_cell();
 			p_rt->set_cell_row_background_color(Color(0.5, 0.5, 0.5, 0.15), Color(0.5, 0.5, 0.5, 0.15));
+			p_rt->set_cell_padding(Rect2(10 * EDSCALE, 10 * EDSCALE, 10 * EDSCALE, 10 * EDSCALE));
 			p_rt->push_color(code_color);
 			codeblock_tag = true;
 			pos = brk_end + 1;