fix -D missing_docs

Author: burrbull

Cargo.lock

@@ -39,7 +39,7 @@ main() {
     esac
 
     # test crate
-    cargo init --name foo $td
+    cargo init --lib --name foo $td
     echo 'cortex-m = "0.7.7"'    >> $td/Cargo.toml
     echo 'cortex-m-rt = "0.7.3"' >> $td/Cargo.toml
     echo 'vcell = "0.1.3"'       >> $td/Cargo.toml

ci/script.sh

@@ -552,6 +552,8 @@ impl U32Ext for u32 {
 
 pub fn build_rs() -> TokenStream {
     quote! {
+        //! Builder file for Peripheral access crate generated by svd2rust tool
+
         use std::env;
         use std::fs::File;
         use std::io::Write;