docs(layouting): fix code blocks

[TomJGooding]

While browsing the documentation I noticed that the code blocks are currently broken on the Layouting page.

I confess I'm not familiar with Doxygen, but simply removing a space from the indentation seems to fix the issue!

Fixes #915

[TomJGooding]

Screenshot for comparison:

[sleeptightAnsiC]

Thanks! Tested locally and it does work.

I've taken a quick look into all code blocks and found one that lacks proper syntax highlight:

Nuklear/src/nuklear.h

Lines 5623 to 5637 in 987c8b8

	* back from the stack:
	*
	* nk_style_push_style_item(ctx, &ctx->style.button.normal, nk_style_item_color(nk_rgb(255,0,0)));
	* nk_style_push_style_item(ctx, &ctx->style.button.hover, nk_style_item_color(nk_rgb(255,0,0)));
	* nk_style_push_style_item(ctx, &ctx->style.button.active, nk_style_item_color(nk_rgb(255,0,0)));
	* nk_style_push_vec2(ctx, &cx->style.button.padding, nk_vec2(2,2));
	*
	* nk_button(...);
	*
	* nk_style_pop_style_item(ctx);
	* nk_style_pop_style_item(ctx);
	* nk_style_pop_style_item(ctx);
	* nk_style_pop_vec2(ctx);
	*
	* Nuklear has a stack for style_items, float properties, vector properties,

^ no need to do anything, but if you're already interested in contributing to docs, you can probably submit another PR for this one too (or even fix it here, it wouldn't be a big deal).

EDIT: tried to fix it myself, but coloring does not seem to change no matter what I do. I'm not super familiar with doxygen neither.

[TomJGooding]

Thanks for the review. I think the problem in the Stack docs should really be a separate PR - this fixes a borked code block rather than just missing syntax highlighting.

[RobLoach]

Thanks. Would like to touch up all the doxygen docs for sure. Make them consistent, and maybe even tweak the config itself.