docs($location): hashPrefix, html5Mode are methods

Closes angular#7915

Author: thorn0

src/ng/location.js

@@ -551,7 +551,7 @@ function $LocationProvider(){
       html5Mode = false;
 
   /**
-   * @ngdoc property
+   * @ngdoc method
    * @name $locationProvider#hashPrefix
    * @description
    * @param {string=} prefix Prefix for hash part (containing path and search)
@@ -567,7 +567,7 @@ function $LocationProvider(){
   };
 
   /**
-   * @ngdoc property
+   * @ngdoc method
    * @name $locationProvider#html5Mode
    * @description
    * @param {boolean=} mode Use HTML5 strategy if available.