Improve code generated documentation

codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/ServerServiceGeneratorV2.kt

@@ -198,6 +198,9 @@ class ServerServiceGeneratorV2(
             /// Constructs a [`$serviceName`] from the arguments provided to the builder.
             ///
             /// Forgetting to register a handler for one or more operations will result in an error.
+            ///
+            /// Check out [`$builderName::build_unchecked`] if you'd prefer the service to return status code 500 when an
+            /// unspecified route requested.
             pub fn build(self) -> Result<$serviceName<#{SmithyHttpServer}::routing::Route<$builderBodyGenericTypeName>>, MissingOperationsError>
             {
                 let router = {
@@ -434,6 +437,8 @@ class ServerServiceGeneratorV2(
     private fun missingOperationsError(): Writable = writable {
         rust(
             """
+            /// The error encountered when calling the [`$builderName::build`] method while one or more operations are not
+            /// specified.
             ##[derive(Debug)]
             pub struct MissingOperationsError {
                 operation_names2setter_methods: std::collections::HashMap<&'static str, &'static str>,