docs/how-to-build.md: use proper markup for directory names
tree18fb3ce40b2c685123ef1dd8e68c725c997e3481
-rw-r--r-- 639 .gitignore
-rw-r--r-- 3273 FEATURES.txt
-rw-r--r-- 988 Makefile
-rw-r--r-- 3664 README.md
-rw-r--r-- 212 Sconfig
drwxr-xr-x - arch
drwxr-xr-x - bin
drwxr-xr-x - contrib
drwxr-xr-x - docs
drwxr-xr-x - exception_lists
drwxr-xr-x - include
drwxr-xr-x - kernel
drwxr-xr-x - lib
drwxr-xr-x - share
drwxr-xr-x - tools
drwxr-xr-x - usr