[Docs] Typo in Spine/Leaf Deployment Doc Deploy Command

This page contains a typo in the file path:
https://docs.openstack.org/tripleo-docs/latest/install/advanced_deployment/routed_spine_leaf_network.html

openstack-tripleo-heat-templates is spelled wrong in the deploy command (templates is spelled as tempaltes).

The issue is at the end of the page in the deploy command:

$ openstack overcloud deploy --templates \
    -n /home/stack/templates/network_data_subnets_routed.yaml
    -r /home/stack/templates/roles_data.yaml \
    -e /home/stack/environments/node_data.yaml \
    -e /usr/share/openstack-tripleo-heat-tempaltes/environments/network-isolation.yaml \
    -e /usr/share/openstack-tripleo-heat-tempaltes/environments/network-environment.yaml \
    -e /home/stack/environments/network-environment-overrides.yaml

If the user copy/pastes that command-line argument, a confusing error message that the file cannot be found is shown. Since those files doesn't really exist (they are rendered in memory from network-environment.j2.yaml and network-isolation.j2.yaml), the user may think there is a problem apart from a typo. This should be fixed immediately.