GSignal: fix trivial docs typo
GSignal: fix trivial docs typo

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