Clarify GInitable docs
Clarify GInitable docs

Mention explicitly that the object is unrefed on error.
Pointed out by Philip Van Hoof,
https://bugzilla.gnome.org/show_bug.cgi?id=641363

ahmedammar/platform_external_gst_glib,zsx/glib,krichter722/glib,gale320/glib,johne53/MB3Glib,lukasz-skalski/glib,Distrotech/glib,zsx/glib,bratsche/glib,Distrotech/glib,johne53/MB3Glib,endlessm/glib,tamaskenez/glib,krichter722/glib,endlessm/glib,pstglia/platform-external-bluetooth-glib,justinkb/aosp-bluez.glib,tchakabam/glib,darren-clark/android_platform_external_bluetooth_glib,bluez-android/glib,ahmedammar/platform_external_gst_glib,cosimoc/glib,krichter722/glib,bratsche/glib,lukasz-skalski/glib,djdeath/glib,zsx/glib,johne53/MB3Glib,iConsole/Console-OS_external_bluetooth_glib,djdeath/glib,iConsole/Console-OS_external_bluetooth_glib,tchakabam/glib,cention-sany/glib,antono/glib,djdeath/glib,ieei/glib,mzabaluev/glib,bluez-android/glib,ieei/glib,mzabaluev/glib,justinkb/aosp-bluez.glib,mzabaluev/glib,antono/glib,bratsche/glib,Distrotech/glib,antono/glib,johne53/MB3Glib,01org/android-bluez-glib,pstglia/platform-external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,MathieuDuponchelle/glib,krichter722/glib,justinkb/aosp-bluez.glib,lukasz-skalski/glib,cosimoc/glib,endlessm/glib,djdeath/glib,cention-sany/glib,bluez-android/glib,Distrotech/glib,cosimoc/glib,gale320/glib,gale320/glib,lukasz-skalski/glib,cosimoc/glib,iConsole/Console-OS_external_bluetooth_glib,MathieuDuponchelle/glib,pstglia/platform-external-bluetooth-glib,endlessm/glib,mzabaluev/glib,pstglia/platform-external-bluetooth-glib,MathieuDuponchelle/glib,tamaskenez/glib,johne53/MB3Glib,lukasz-skalski/glib,pstglia/platform-external-bluetooth-glib,tamaskenez/glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,iConsole/Console-OS_external_bluetooth_glib,antono/glib,tamaskenez/glib,justinkb/aosp-bluez.glib,MathieuDuponchelle/glib,iConsole/Console-OS_external_bluetooth_glib,cention-sany/glib,01org/android-bluez-glib,bluez-android/glib,pstglia/external-bluetooth-glib,krichter722/glib,cention-sany/glib,ahmedammar/platform_external_gst_glib,tamaskenez/glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,ieei/glib,tchakabam/glib,ieei/glib,bratsche/glib,bluez-android/glib,johne53/MB3Glib,darren-clark/android_platform_external_bluetooth_glib,zsx/glib,ieei/glib,ahmedammar/platform_external_gst_glib,tchakabam/glib,pstglia/external-bluetooth-glib,01org/android-bluez-glib,cention-sany/glib,tchakabam/glib,01org/android-bluez-glib,cosimoc/glib,Distrotech/glib,pstglia/external-bluetooth-glib,justinkb/aosp-bluez.glib,mzabaluev/glib,endlessm/glib,MathieuDuponchelle/glib,gale320/glib,01org/android-bluez-glib,gale320/glib,djdeath/glib