docs(wasm-languages): grain updates

Signed-off-by: Vaughn Dice <[email protected]>

Author: vdice

content/wasm-languages/grain.md

@@ -46,36 +46,42 @@ To use Grain, you will need to [install the Grain toolkit](https://grain-lang.or
 Start with a `hello.gr` file:
 
 ```
-print("content-type: text/plain\n")
-print("\n)
-print("Hello, World!")
+module Main
+
+provide let _start = () => {
+  print("content-type: text/plain\n")
+  print("\n)
+  print("Hello, World!")
+}
 ```
 
 Compile the program with the `grain` compiler:
 
 ```console
-$ grain hello.gr
+$ grain compile --release --use-start-section hello.gr
 ```
 
 The above will produce a `hello.gr.wasm` file. As usual, you can run `wasmtime hello.gr.wasm` to see the output. The first time you compile a grain application, it will take a long time. After that, compiling is much faster.
 
 To run the WebAssembly app with Spin, create a `spin.toml` file:
 
 ```
-spin_version = "1"
-authors = ["Fermyon Engineering <[email protected]>"]
-description = "Grain example."
+spin_manifest_version = 2
+
+[application]
 name = "spin-grain"
-trigger = { type = "http", base = "/" }
 version = "1.0.0"
+description = "Grain example."
+authors = ["Fermyon Engineering <[email protected]>"]
 
-[[component]]
-id = "grain-hello"
-source = "hello.gr.wasm"
-[component.trigger]
+[[trigger.http]]
+id = "trigger-grain-hello"
+component = "grain-hello"
 route = "/"
-# Spin components written in Grain use the Wagi HTTP executor
 executor = { type = "wagi" }
+
+[component.grain-hello]
+source = "hello.gr.wasm"
 ```
 
 From there, you can use `spin up` to start a server, and see the results on `http://localhost:3000`.