Design documentation: fix broken link

This fixes a regression introduced by 8ed95a (Move pages and update PO files)

wiki/src/contribute/design/persistence.mdwn

@@ -153,7 +153,7 @@ User interface
 A *Configure persistent storage* menu entry is the entry point to the
 *bootstrap persistent storage* UI. This UI allows the user to set up
 a persistent storage container in the free space left on the USB stick
-by [[Tails Installer|usb_installation]].
+by [[Tails Installer|installation]].
 
 Choosing persistence is something *activelly* opt-in, i.e. "I want
 this, I read the documentation for related information, then run the