fix typo

Co-authored-by: Irina Nita <irina.nita@posteo.com>

Author: alexandruradovici

docs/linux_kernel_development/3.poweroff/2.poweroff_arm64.md

@@ -19,7 +19,7 @@ and uses them similar to hypervisor calls. It executes actions based on the valu
 - register `x0` stores the command `SYS_*`
 - register `x1` stores a reference (pointer) to the exit reason
 
-We have to enable `semihsoting` in  QEMU by appending `-semihosting` to the command line.
+We have to enable `semihosting` in  QEMU by appending `-semihosting` to the command line.
 
 ```rust
 unsafe {