message: Add clarity to TOC
  Bolded the sections for clarity.
diff: # Table of Contents
  -* [Errors](#errors)
  +* **[Errors](#errors)**
  * [I get `ResourceNotFound("/myfile", ...)` even though it's in the resource dir!](#errors_resource)
  * [Why do I get `WindowError("Could not create GL context")` when I try to run my game?](#errors_window)
  -* [Graphics and GUIs](#gfx)
  +* **[Graphics and GUIs](#gfx)**
  * [Can I do 3D stuff?](#gfx_3d)
  * [How do I make a GUI?](#gfx_gui)
  * [Resolution independence](#gfx_resolution)
  -* [Libraries](#libraries)
  +* **[Libraries](#libraries)**
  * [Can I use `specs`, `legion` or another entity-component system?](#library_ecs)
  -* [Performance](#performance)
  +* **[Performance](#performance)**
  * [Image/sound loading and font rendering is slow!](#perf_slow1)
  * [Text rendering is still slow!](#perf_text)
  * [That's lame, can't I just compile my game in debug mode but ggez with optimizations on?](#perf_debug)
  * [Drawing a few hundred images or shapes is slow!](#perf_drawing)
  -* [Platform-specific](#platforms)
  +* **[Platform-specific](#platforms)**
  * [How do I build on platform X?](#platform_build)
  * [Is Mac/iOS supported?](#platform_mac)
  -* [Contributing to ggez](#contributing)
  +* **[Contributing to ggez](#contributing)**
  * [If I write X, will you include it in ggez?](#contribute_inclusion)
  -* [Miscellaneous](#misc)
  +* **[Miscellaneous](#misc)**
  * [How do I load my `conf.toml` file?](#misc_conf)
  * [I get a console window when I launch my executable on Windows](#misc_win_console)
  