add FEW warning to aray()

Author: ksen0

src/math/p5.Vector.js

@@ -2701,10 +2701,14 @@ class Vector {
    *   let v = createVector(20, 30);
    *
    *   // Prints "[20, 30]" to the console.
-   *   print(v.values);
+   *   print(v.array());
    * }
    */
   array() {
+    this._friendlyError(
+      'To get the contents of a vector v, use v.values. In future versions, v.array() may be deprecated.()',
+      'p5.Vector.array()'
+    );
     return [this.x || 0, this.y || 0, this.z || 0];
   }