Update flags

Author: gkjohnson

src/core/renderer/API.md

@@ -707,7 +707,7 @@ extend this class to add camera projection, scene management, and tile display.
 ### .root
 
 ```js
-root: Tile | null
+readonly root: Tile | null
 ```
 
 Root tile of the loaded root tileset, or null if not yet loaded.
@@ -716,7 +716,7 @@ Root tile of the loaded root tileset, or null if not yet loaded.
 ### .loadProgress
 
 ```js
-loadProgress: number
+readonly loadProgress: number
 ```
 
 Fraction of tiles loaded since the last idle state, from 0 (nothing loaded) to 1 (all loaded).

src/core/renderer/tiles/TilesRendererBase.js

@@ -320,6 +320,7 @@ export class TilesRendererBase {
 	/**
 	 * Root tile of the loaded root tileset, or null if not yet loaded.
 	 * @type {Tile|null}
+	 * @readonly
 	 */
 	get root() {
 
@@ -338,6 +339,7 @@ export class TilesRendererBase {
 	/**
 	 * Fraction of tiles loaded since the last idle state, from 0 (nothing loaded) to 1 (all loaded).
 	 * @type {number}
+	 * @readonly
 	 */
 	get loadProgress() {