Update scripting docs

Author: mxcl

docs/scripting.md

@@ -90,14 +90,40 @@ Use [Deno](https://deno.land):
 import fs from "npm:fs";
 ```
 
-### Rust, Go, C, C++, etc
+### Rust
+
+```rust
+#!/usr/bin/env -S pkgx rust-script
+
+//! ```cargo
+//! [dependencies]
+//! time = "0.1.25"
+//! ```
+```
+
+> [!TIP]
+> Probably you should specify a more precise Rust version as a plus-pkg arg.
+
+### Go, C, C++, etc
 
 Use [Scriptisto]:
 
-```sh
-#!/usr/bin/env -S pkgx +cargo scriptisto
+```c
+#!/usr/bin/env pkgx +clang +pkg-config scriptisto
+
+#include <stdio.h>
+#include <glib.h>
+
+// scriptisto-begin
+// script_src: main.c
+// build_cmd: clang -O2 main.c `pkg-config --libs --cflags glib-2.0` -o ./script
+// scriptisto-end
 
-# snip… type `pkgx scriptisto new cargo` for the rest.
+int main(int argc, char *argv[]) {
+  gchar* user = g_getenv("USER");
+  printf("Hello, C! Current user: %s\n", user);
+  return 0;
+}
 ```
 
 ## Mash