GApplication: Beef up the local_command_line() docs
GApplication: Beef up the local_command_line() docs

This adds some details, such as the meaning of @argc, @argv and @status,
even though gtk-doc does not make it easy to document vfunc arguments.
Requested in
https://bugzilla.gnome.org/show_bug.cgi?id=643478

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