docs(context): document the browser() call from persistent context (#36216)

Author: agg23

docs/src/api/class-browsercontext.md

@@ -467,7 +467,7 @@ All existing background pages in the context.
 * since: v1.8
 - returns: <[null]|[Browser]>
 
-Returns the browser instance of the context. If it was launched as a persistent context null gets returned.
+Gets the browser instance that owns the context. Returns `null` if the context is created outside of normal browser, e.g. Android or Electron.
 
 ## async method: BrowserContext.clearCookies
 * since: v1.8

packages/playwright-client/types/types.d.ts

@@ -8840,7 +8840,8 @@ export interface BrowserContext {
   backgroundPages(): Array<Page>;
 
   /**
-   * Returns the browser instance of the context. If it was launched as a persistent context null gets returned.
+   * Gets the browser instance that owns the context. Returns `null` if the context is created outside of normal
+   * browser, e.g. Android or Electron.
    */
   browser(): null|Browser;
 

packages/playwright-core/types/types.d.ts

@@ -8840,7 +8840,8 @@ export interface BrowserContext {
   backgroundPages(): Array<Page>;
 
   /**
-   * Returns the browser instance of the context. If it was launched as a persistent context null gets returned.
+   * Gets the browser instance that owns the context. Returns `null` if the context is created outside of normal
+   * browser, e.g. Android or Electron.
    */
   browser(): null|Browser;