Merge "ashmem: update example code of create shmem region"

 *     int fd = ASharedMemory_create("memory", 128);

 *

 *     // By default it has PROT_READ | PROT_WRITE | PROT_EXEC.

 *     char *buffer = (char *) mmap(NULL, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

 *     size_t memSize = ASharedMemory_getSize(fd);

 *     char *buffer = (char *) mmap(NULL, memSize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

 *

 *     strcpy(buffer, "This is an example."); // trivially initialize content

 *