docs(guide/Using $location): format parameter name

Format parameter name as code. (It's used elsewhere in this doc page in code examples, as code itself.)

Author: dguzzo

docs/content/guide/$location.ngdoc

@@ -693,7 +693,7 @@ A path should always begin with forward slash (`/`); the `$location.path()` sett
 forward slash if it is missing.
 
 Note that the `!` prefix in the hashbang mode is not part of `$location.path()`; it is actually
-hashPrefix.
+`hashPrefix`.
 
 ## Crawling your app