Fix formatting underlines

Using-the-command-line.md

@@ -1,9 +1,9 @@
 # CLI
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 At its core, RetroArch is a command-line application. Getting familiar with the command-line helps you understand the design principles of RetroArch.
 
 ## Loading a ROM and libretro core
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     retroarch -L /path/to/libretro/core.so game.rom
 
 ### Get verbose logging output
@@ -22,7 +22,7 @@ To help creating configs with a GUI, RetroArch-Phoenix is a suitable frontend.
 The config file with all options are documented [here](https://raw.github.com/Themaister/RetroArch/master/retroarch.cfg). On Linux and OSX, it is normally installed to `/etc/retroarch.cfg`. On Windows releases you'll find it in the directory along with `retroarch.exe` after a fresh zip extraction (it quickly gets overwritten).
 
 ## `retroarch --help`
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 Use it. You'll probably discover some features you didn't think about.
    
     ===================================================================
@@ -86,7 +86,8 @@ Use it. You'll probably discover some features you didn't think about.
         -D/--detach: Detach RetroArch from the running console. Not relevant for all platforms.
 
 ## `retroarch --features`
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 If you're unsure if a particular feature is compiled in, this helps:
 
     Features: