[DOC]: admin: troubleshooting: Fix code-block statements
[DOC]: admin: troubleshooting: Fix code-block statements

Add missing new line after the code-block statements to fix generation
of the service restart commands.

Change-Id: I35e7da5d1cfb492503724fec419cf1ef7eea7dea

bunchc/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible,openstack/openstack-ansible,stackforge/os-ansible-deployment,stackforge/os-ansible-deployment