Add cd, export and enable service command in doc

While installing the API service and Engine, sample configuration file
is needed to generate inside murano/murano using tox. Hence add cd
command.

While installing and running murano with devstack, environment
variable DEVSTACK_DIR is used. Add export command to set environment
varible. Neutron additional service is also required by murano which
do not come by default with devstack. It is mention and add command to
enable it.

Closes-Bug: #1492192
Change-Id: I2313460f8eae870de2722c078f1676245cb605d7

contrib/devstack/README.rst

@@ -1,18 +1,24 @@
 1. Follow Devstack documentation to setup a host for Devstack. Then clone
    Devstack source code.
 
-2. Copy Murano integration scripts to Devstack::
+2. Copy Murano integration scripts to Devstack either by setting environment
+   variable or providing complete path to devstack directory. Below one is using
+   environment variable::
 
+      export DEVSTACK_DIR=<complete path to devstack directory(clonned)>
       cp lib/murano ${DEVSTACK_DIR}/lib
       cp lib/murano-dashboard ${DEVSTACK_DIR}/lib
       cp extras.d/70-murano.sh ${DEVSTACK_DIR}/extras.d
 
 3. Create a ``localrc`` file as input to devstack.
 
-4. The Murano services are not enabled by default, so they must be
+4. The Murano, Neutron and Heat services are not enabled by default, so they must be
    enabled in ``localrc`` before running ``stack.sh``. This example ``localrc``
    file shows all of the settings required for Murano::
 
+      # Enable Neutron
+      ENABLED_SERVICES+=,q-svc,q-agt,q-dhcp,q-l3,q-meta,neutron
+
       # Enable Heat
       enable_service heat h-api h-api-cfn h-api-cw h-eng
 

doc/source/install/manual.rst

@@ -131,6 +131,7 @@ Install the API service and Engine
 
     .. code-block:: console
 
+        cd ~/murano/murano
         tox -e genconfig
     ..