docs: Fix syntax highlighting
Change-Id: Iffa8e200b8c1aa82ba7348f14237597da8ab1fde
diff --git a/index.md b/index.md
index 4714767..ebb34eb 100644
--- a/index.md
+++ b/index.md
@@ -61,15 +61,15 @@
No patches will be applied!
-```
-$ mkdir build-for-clearfog
-$ cd build-for-clearfog
-$ vim local.mk
+```sh
+mkdir build-for-clearfog
+cd build-for-clearfog
+vim local.mk
# ...edit as shown above...
-$ make O=$PWD -C /home/cesnet/gerrit/github/buildroot/buildroot \
+make O=$PWD -C /home/cesnet/gerrit/github/buildroot/buildroot \
BR2_EXTERNAL=/home/cesnet/gerrit/CzechLight/br2-external \
czechlight_clearfog_defconfig
-$ make
+make
```
A full rebuild takes between 30 and 45 minutes on a T460s laptop for targets which use a pre-generated Linaro toolchain (`clearfog`, `beaglebone`).