Merge pull request #2667 from kocio-pl/doc-extension-fix

Small INSTALL.md code readability fix

INSTALL.md

@@ -3,7 +3,13 @@
 ## OpenStreetMap data
 You need OpenStreetMap data loaded into a PostGIS database (see below for [dependencies](#dependencies)). These stylesheets expect a database generated with osm2pgsql using the pgsql backend (table names of `planet_osm_point`, etc), the default database name (`gis`), and the [lua transforms](https://github.com/openstreetmap/osm2pgsql/blob/master/docs/lua.md) documented in the instructions below.
 
-Start by setting up your database to have PostGIS and hstore with ``psql -d gis -c 'CREATE EXTENSION postgis; CREATE EXTENSION hstore;'``, then grab some OSM data. It's probably easiest to grab an PBF of OSM data from [Mapzen](https://mapzen.com/metro-extracts/) or [geofabrik](http://download.geofabrik.de/). Once you've done that, import with osm2pgsql:
+Start by setting up your database to have PostGIS and hstore with 
+
+```
+psql -d gis -c 'CREATE EXTENSION postgis; CREATE EXTENSION hstore;'
+```
+
+then grab some OSM data. It's probably easiest to grab an PBF of OSM data from [Mapzen](https://mapzen.com/data/metro-extracts/) or [Geofabrik](http://download.geofabrik.de/). Once you've done that, import with osm2pgsql:
 
 ```
 osm2pgsql -G --hstore --style openstreetmap-carto.style --tag-transform-script openstreetmap-carto.lua -d gis ~/path/to/data.osm.pbf