cleanup

Signed-off-by: Gal Ovadia <ggalovadia@gmail.com>

Author: ovadiagal

rust/src/lib.rs

@@ -64,8 +64,14 @@ pub mod listener_tls_detector;
 // Implements a system for defining egress policies by hostname.
 pub mod egress_policies;
 
-// Program initialization function called before any filters are created.
-// Return true to indicate successful initialization, false to fail module loading.
+/// This implements the [`envoy_proxy_dynamic_modules_rust_sdk::ProgramInitFunction`].
+///
+/// This is called exactly once when the module is loaded. It can be used to
+/// initialize global state as well as check the runtime environment to ensure that
+/// the module is running in a supported environment.
+///
+/// Returning `false` will cause Envoy to reject the config hence the
+/// filter will not be loaded.
 fn program_init() -> bool {
     envoy_log_info!("Rust dynamic module initialized");
     true