Fix minor typos in platform-*.cc

src/platform-macos.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Platform specific code for MacOS goes here. For the POSIX comaptible parts
-// the implementation is in platform-posix.cc.
+// Platform-specific code for MacOS goes here. For the POSIX-compatible
+// parts, the implementation is in platform-posix.cc.
 
 #include <dlfcn.h>
 #include <unistd.h>
 #include <sys/mman.h>
 #include <mach/mach_init.h>
 #include <mach-o/dyld.h>
 #include <mach-o/getsect.h>
 
 #include <AvailabilityMacros.h>
 
@@ skipping 286 matching lines @@
 bool VirtualMemory::ReleaseRegion(void* address, size_t size) {
   return munmap(address, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   return false;
 }
 
 } }  // namespace v8::internal