improve syntax highlighting for vagrant scripts

vagrant/Install-on-Ubuntu-16.sh

@@ -18,6 +18,7 @@ export DEBIAN_FRONTEND=noninteractive #DOCS:
 # Make sure all packages are are up-to-date by running:
 #
 
+#DOCS:    :::sh
     sudo apt-get -o DPkg::options::="--force-confdef" -o DPkg::options::="--force-confold" --force-yes -fuy install grub-pc #DOCS:
     sudo apt-get update -qq
 
@@ -100,7 +101,7 @@ export DEBIAN_FRONTEND=noninteractive #DOCS:
 # You need to create an alias to the website directory in your apache
 # configuration. Add a separate nominatim configuration to your webserver:
 
-#DOCS:```
+#DOCS:```sh
 sudo tee /etc/apache2/conf-available/nominatim.conf << EOFAPACHECONF
 <Directory "$USERHOME/build/website"> #DOCS:<Directory "$USERHOME/Nominatim/build/website">
   Options FollowSymLinks MultiViews
@@ -131,12 +132,10 @@ sudo sed -i 's:#.*::' /etc/apache2/conf-available/nominatim.conf #DOCS:
 #
 # Get the source code from Github and change into the source directory
 #
-if [ "x$1" == "xyes" ]; then  #DOCS:
-
+if [ "x$1" == "xyes" ]; then  #DOCS:    :::sh
     cd $USERHOME
     git clone --recursive git://github.com/openstreetmap/Nominatim.git
     cd Nominatim
-
 else                               #DOCS:
     cd $USERHOME/Nominatim         #DOCS:
 fi                                 #DOCS:
@@ -144,14 +143,14 @@ fi                                 #DOCS:
 # When installing the latest source from github, you also need to
 # download the country grid:
 
-if [ ! -f data/country_osm_grid.sql.gz ]; then       #DOCS:
+if [ ! -f data/country_osm_grid.sql.gz ]; then       #DOCS:    :::sh
     wget -O data/country_osm_grid.sql.gz https://www.nominatim.org/data/country_grid.sql.gz
 fi                                 #DOCS:
 
 # The code must be built in a separate directory. Create this directory,
 # then configure and build Nominatim in there:
 
-    cd $USERHOME                   #DOCS:
+    cd $USERHOME                   #DOCS:    :::sh
     mkdir build
     cd build
     cmake $USERHOME/Nominatim
@@ -160,7 +159,7 @@ fi                                 #DOCS:
 # You need to create a minimal configuration file that tells nominatim
 # where it is located on the webserver:
 
-#DOCS:```
+#DOCS:```sh
 tee settings/local.php << EOF
 <?php
  @define('CONST_Website_BaseURL', '/nominatim/');