fixed link in pv doc

docs/persistent-volumes.md

@@ -77,7 +77,7 @@ Each PV contains a spec and status, which is the specification and status of the
 
 ### Capacity
 
-Generally, a PV will have a specific storage capacity.  This is set using the PV's `capacity` attribute.  See the Kubernetes [Resource Model](./resources.md) to understand the units expected by `capacity`.
+Generally, a PV will have a specific storage capacity.  This is set using the PV's `capacity` attribute.  See the Kubernetes [Resource Model](./design/resources.md) to understand the units expected by `capacity`.
 
 Currently, storage size is the only resource that can be set or requested.  Future attributes may include IOPS, throughput, etc.
 
@@ -145,7 +145,7 @@ Claims use the same conventions as volumes when requesting storage with specific
 
 ### Resources
 
-Claims, like pods, can request specific quantities of a resource.  In this case, the request is for storage.  The same [resource model](./resources.md) applies to both volumes and claims.
+Claims, like pods, can request specific quantities of a resource.  In this case, the request is for storage.  The same [resource model](./design/resources.md) applies to both volumes and claims.
 
 ## <a name="claims-as-volumes"></a> Claims As Volumes