docs(api): add missing callback parameter to waitForRequestFinished (#6893)

Author: yury-s

docs/src/api/java.md

@@ -74,6 +74,8 @@ playwright.close();
 
 ### param: Page.waitForRequest.callback = %%-java-wait-for-event-callback-%%
 
+### param: Page.waitForRequestFinished.callback = %%-java-wait-for-event-callback-%%
+
 ### param: Page.waitForResponse.callback = %%-java-wait-for-event-callback-%%
 
 ### param: Page.waitForNavigation.callback = %%-java-wait-for-event-callback-%%