[BridgeAbstract] Fix return values of get* functions

BridgeAbstract.md

@@ -169,7 +169,7 @@ This function returns the name of the bridge as it will be displayed on the main
 
 ```PHP
 	public function getName(){
-		return $this->name;
+		return self::NAME;
 	}
 ```
 
@@ -181,7 +181,7 @@ This function returns the URI to the destination site of the bridge. It will be
 
 ```PHP
 	public function getURI(){
-		return $this->uri;
+		return self::URI;
 	}
 ```