Update y-coordinates for annotations in annotations.json

Adjusted the y-coordinate values for annotations with id 1, 2,
and 3 in annotations.json to reposition them on their respective
pages:
- Changed y for id 1 from 980.0 to 380.0.
- Changed y for id 2 from 980.0 to 680.0.

EnvelopeGenerator.ReceiverUI/wwwroot/fake-data/annotations.json

@@ -3,13 +3,13 @@
     "id": 1,
     "page": 1,
     "x": 390.0,
-    "y": 980.0
+    "y": 380.0
   },
   {
     "id": 2,
     "page": 2,
     "x": 390.0,
-    "y": 980.0
+    "y": 680.0
   },
   {
     "id": 3,