Everywhere: Fix more typos

Author: https://github.com/linusg
Commit: bcfc6f0c57
Pull-request: https://github.com/SerenityOS/serenity/pull/3668
Reviewed-by: https://github.com/bugaevc
Reviewed-by: https://github.com/xTibor

Kernel/Scheduler.cpp

@@ -699,7 +699,7 @@ void Scheduler::enter_current(Thread& prev_thread)
 
 void Scheduler::leave_on_first_switch(u32 flags)
 {
-    // This is called when a thread is swiched into for the first time.
+    // This is called when a thread is switched into for the first time.
     // At this point, enter_current has already be called, but because
     // Scheduler::context_switch is not in the call stack we need to
     // clean up and release locks manually here