Update pds-migrator.md

Author: sjoerdvangroning

pds-migrator.md

@@ -9,7 +9,7 @@ Creating an app that makes moving data easy is our first step.
 ## Sustainable Storage
 When your data is in a SOLID POD and you are using five different social networks,  three email clients, maybe hundreds of apps, moving your storage backend is a PITA when you need to change it at all those suppliers. We want to change this.
 Redirecting: http status codes (B, C)
-When PODs are migrated, it would be great if apps would still be able to reach the data. We would like to extend the specification. And the user should be in control. 
+When PODs are migrated, it would be great if apps would still be able to reach the data. We would like to extend the Solid specification. And the user should be in control. 
 - 301 - Moved elsewhere permanently (key change)
 - 307 - Temporary moved, (good change, maintenance?)
 - 404 - Nothing here. (right to be forgotten? able to reuse?)