fixes return types for mongoose document array create() and id()

mongoose/mongoose-tests.ts

@@ -492,6 +492,16 @@ documentArray.toObject({}).length;
 documentArray.$shift();
 /* inherited from Native Array */
 documentArray.concat();
+/* practical example */
+interface MySubEntity1 extends mongoose.Types.Subdocument {
+  property1: string;
+  property2: string;
+}
+interface MyEntity1 extends mongoose.Document {
+  sub: mongoose.Types.DocumentArray<MySubEntity>
+}
+var newEnt: MyEntity1;
+var newSub: MySubEntity1 = newEnt.sub.create({ property1: "example", property2: "example" });
 
 /*
  * section types/buffer.js

mongoose/mongoose.d.ts

@@ -1045,13 +1045,13 @@ declare module "mongoose" {
        * This is the same subdocument constructor used for casting.
        * @param obj the value to cast to this arrays SubDocument schema
        */
-      create(obj: Object): Subdocument;
+      create(obj: Object): T;
 
       /**
        * Searches array items for the first document with a matching _id.
        * @returns the subdocument or null if not found.
        */
-      id(id: ObjectId | string | number | NativeBuffer): Embedded;
+      id(id: ObjectId | string | number | NativeBuffer): T;
 
       /** Helper for console.log */
       inspect(): T[];