Docs: update the QAndroidApplication::context() documentation

The word "main" here is confusing. use "most recently started" instead.

Fixes: QTBUG-86203
Pick-to: 6.2 6.5 6.7
Change-Id: I3fd4e49204fac8a2f97cdfc57d5f7901fa7b96a6
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/corelib/platform/android/qandroidnativeinterface.cpp

@@ -49,7 +49,7 @@ QT_DEFINE_NATIVE_INTERFACE(QAndroidApplication);
     \fn QJniObject QNativeInterface::QAndroidApplication::context()
 
     Returns the Android context as a \c QJniObject. The context is an \c Activity
-    if the main activity object is valid. Otherwise, the context is a \c Service.
+    if the most recently started activity object is valid. Otherwise, the context is a \c Service.
 
     \since 6.2
 */