Update Cookbook.md

docs/Cookbook.md

@@ -155,27 +155,28 @@ Limitations:
 Create `hello.wat`:
 ```wat
 (module
-    ;; wasi_unstable!fd_write(file_descriptor, *iovs, iovs_len, nwritten) -> status_code
-    (import "wasi_unstable" "fd_write" (func $fd_write (param i32 i32 i32 i32) (result i32)))
+    ;; wasi_snapshot_preview1!fd_write(file_descriptor, *iovs, iovs_len, nwritten) -> status_code
+    (import "wasi_snapshot_preview1" "fd_write" (func $fd_write (param i32 i32 i32 i32) (result i32)))
 
     (memory 1)
     (export "memory" (memory 0))
 
     ;; Put a message to linear memory at offset 32
-    (data (i32.const 32) "Hello, world\n")
+    (data (i32.const 32) "Hello, world!\n")
 
     (func $main (export "_start")
-        ;; Create a new io vector
-        (i32.store (i32.const 0) (i32.const 32))  ;; iov.iov_base - pointer to the start of the message
-        (i32.store (i32.const 4) (i32.const 13))  ;; iov.iov_len  - length of the message
+        ;; Create a new io vector at address 0x4
+        (i32.store (i32.const 4) (i32.const 32))  ;; iov.iov_base - pointer to the start of the message
+        (i32.store (i32.const 8) (i32.const 14))  ;; iov.iov_len  - length of the message
 
         (call $fd_write
             (i32.const 1)  ;; file_descriptor - 1 for stdout
-            (i32.const 0)  ;; *iovs           - pointer to the io vector
+            (i32.const 4)  ;; *iovs           - pointer to the io vector
             (i32.const 1)  ;; iovs_len        - count of items in io vector
             (i32.const 20) ;; nwritten        - where to store the number of bytes written
         )
         drop ;; discard the WASI status code
+    )
 )
 ```