sync advice with instructions in create-weblogic-domain-pv-pvc/README.md

Author: vkraemer

kubernetes/samples/scripts/create-weblogic-domain/domain-home-on-pv/README.md

@@ -415,9 +415,15 @@ Then you should [delete the resources for your sample domain](../../delete-domai
 ```
 create-domain.sh
 ```
-A correct value for weblogicDomainStoragePath will meet the following requirements
-* owned by the user that started the operator
-* exists
-* is a directory
+A correct value for weblogicDomainStoragePath will meet the following requirements:
+* Must be the name of a directory
+* the directory must be world writable.  
+Optionally, follow these steps to tighten permissions on the named directory after you run the sample the first time.
+    * become the root user
+    * ls -nd $value-of-weblogicDomainStoragePath
+        * Note the values of the third and fourth field of the output
+    * chown $third-field:$fourth-field $value-of-weblogicDomainStoragePath
+    * chmod 755 $value-of-weblogicDomainStoragePath
+    * return to your normal user id
 3. Message: "ERROR: The create domain job will not overwrite an existing domain. The domain folder /shared/domains/domain1 already exists"  
 You will see this message if the directory domains/domain1 exists in the directory named as the value of weblogicDomainStoragePath in create-pv-pvc-inputs.yaml. For example, if the value of  weblogicDomainStoragePath is `/tmp/wls-op-4-k8s`, you would need to remove (or move) `/tmp/wls-op-4-k8s/domains/domain1`.