Plane: add missing AccZ bit from GCS_PID_MASK doc #43911

Job	Run time
build (stm32f7, chibios, 10)	4m 3s
build (stm32h7, chibios, 10)	3m 21s
build (fmuv2-plane, chibios, 10)	1m 45s
build (periph-build, chibios, 10)	3m 53s
build (iofirmware, chibios, 10)	1m 18s
build (CubeOrange-bootloader, chibios, 10)	53s
build (fmuv3-bootloader, chibios, 10)	1m 4s
build (revo-bootloader, chibios, 10)	54s
build (stm32h7-debug, chibios, 10)	2m 12s
build (fmuv3, chibios, 10)	5m 31s
build (revo-mini, chibios, 10)	4m 10s
build (MatekF405-Wing, chibios, 10)	4m 33s
build (CubeOrange-ODID, chibios, 10)	2m 34s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 13s
build (configure-all, chibios, 10)	10m 42s
build (build-options-defaults-test, chibios, 10)	7m 3s
build (signing, chibios, 10)	2m 38s
build (CubeOrange-PPP, chibios, 10)	2m 0s
build (CubeRed-EKF2, chibios, 10)	2m 4s
build (SOHW, chibios, 10)	3m 45s
build (Pixhawk6X-PPPGW, chibios, 10)	1m 29s
build (new-check, chibios, 10)	4m 21s
	1h 11m 26s

Provide feedback