Fix QAndroidJniObject documentation errors/inconsistencies

Change-Id: Ica7189c104d239183cf976956bfa63bd666424ab
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
Doc: document Qt Notification example

Change-Id: I31500a15f61ab4aecba623fed4cbeeb9292520cf
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Fix use of va_list in QAndroidJniObject

va_list functions where update to work on x86 where va_list is defined
as char*.

Change-Id: If1286a36d766b8536ca9a83ca21791d30b7b307c
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Merge remote-tracking branch 'origin/5.4' into dev

Change-Id: Ie41284439a6f89e231837e2e50d1624c3cf7f37f