Fix minor typos in platform-*.cc

src/platform-openbsd.cc

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-// Platform specific code for OpenBSD and NetBSD goes here. For the POSIX
-// comaptible parts the implementation is in platform-posix.cc.
+// Platform-specific code for OpenBSD and NetBSD goes here. For the
+// POSIX-compatible parts, the implementation is in platform-posix.cc.
 
 #include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <stdlib.h>
 
@@ skipping 315 matching lines @@
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   // TODO(alph): implement for the platform.
   return false;
 }
 
 } }  // namespace v8::internal