docs: clarify captured at timestamp

src/api/ents/SpatialImageEnt.ts

@@ -21,7 +21,9 @@ export interface SpatialImageEnt extends CameraEnt, IDEnt {
     atomic_scale?: number;
 
     /**
-     * Timestamp when the image was captured.
+     * Timestamp representing the capture date and time.
+     *
+     * @description Unix epoch timestamp in milliseconds.
      */
     captured_at: number;
 

src/graph/Image.ts

@@ -125,6 +125,9 @@ export class Image {
     /**
      * Get capturedAt.
      *
+     * @description Timestamp of the image capture date
+     * and time represented as a Unix epoch timestamp in milliseconds.
+     *
      * @returns {number} Timestamp when the image was captured.
      */
     public get capturedAt(): number {