update how it works url

site/concepts/encryption.md

@@ -6,7 +6,7 @@ search_type: Documentation
 
 
 Weave Net peers
-[communicate with each other over both TCP and UDP](/site/how-it-works.md). This
+[communicate with each other over both TCP and UDP](/site/concepts/how-it-works.md). This
 communication
 [can be encrypted](/site/using-weave/security-untrusted-networks.md).
 

site/troubleshooting.md

@@ -79,7 +79,7 @@ $ weave status
 ```
 
 The terms used here are explained further at
-[How Weave Net Works](/site/how-it-works.md).
+[How Weave Net Works](/site/concepts/how-it-works.md).
 
  * **Version** - shows the Weave Net version. If checkpoint is enabled (i.e.
 `CHECKPOINT_DISABLE` is not set), information about existence of a new version