fix comments in php7.Syntax

std/php7/Syntax.hx

@@ -54,7 +54,7 @@ extern class Syntax {
 
     /**
         ```
-        PHP.foreach(collection, function(key, value) trace(key, value));
+        Syntax.foreach(collection, function(key, value) trace(key, value));
         ```
         generates:
         ```
@@ -101,7 +101,7 @@ extern class Syntax {
 
     /**
         ```
-        PHP.arrayDecl(arg1, arg2, arg3);
+        Syntax.arrayDecl(arg1, arg2, arg3);
         ```
         Generates native array declaration:
         ```
@@ -124,4 +124,4 @@ extern class Syntax {
         Add errors suppression operator `@` before `expression`
     **/
     static function suppress<T>( expression:T ) : T;
-}
+}