Description of problem:
Browse to storage creating page, check "Learn more" in several places, it direct to invalid url.

Version-Release number of selected component (if applicable):
OpenShift Master:     v3.6.173.0.49
Kubernetes Master:    v1.6.1+5115d708d7 

How reproducible:
Always

Steps to Reproduce:
1. Browse to storage creating page: console/project/myproject/create-pvc
2. Check Learn More link below to the "Storage Class" drop-down list
3. Expand "Use label selectors to request storage.", check Learn More link below to the "Label Selector"

Actual results:
2. It links to https://docs.openshift.com/dedicated/install_config/persistent_storage/dynamically_provisioning_pvs.html and it's 404
3. It links to https://docs.openshift.com/dedicated/install_config/persistent_storage/selector_label_binding.html and it's 404

Expected results:
2&3. Should display the doc page correctly.

Additional info: