Fix typo in docs for extension point
Fix typo in docs for extension point

Introduced in fcd3e3422749ddbbf29809fcc90ffe8df9d5f696

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