Fix minor typos in platform-*.cc

src/platform-cygwin.cc

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-// Platform specific code for Cygwin goes here. For the POSIX comaptible parts
-// the implementation is in platform-posix.cc.
+// Platform-specific code for Cygwin goes here. For the POSIX-compatible
+// parts, the implementation is in platform-posix.cc.
 
 #include <errno.h>
 #include <pthread.h>
 #include <semaphore.h>
 #include <stdarg.h>
 #include <strings.h>    // index
 #include <sys/time.h>
 #include <sys/mman.h>   // mmap & munmap
 #include <unistd.h>     // sysconf
 
@@ skipping 308 matching lines @@
   return VirtualFree(base, 0, MEM_RELEASE) != 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   // TODO(alph): implement for the platform.
   return false;
 }
 
 } }  // namespace v8::internal