add gh issue reference for serde_html_form bug

phono-server/src/presentation_form.rs

@@ -14,6 +14,7 @@ use crate::errors::AppError;
 /// `#[serde(flatten)]`, Serde's buffering strategy causes `flatten` to break
 /// deserialization of `Vec<_>` fields when provided with a sequence of length
 /// == 1. `#[serde(flatten)]` should be avoided.
+/// (Refer to: https://github.com/jplatte/serde_html_form/issues/25.)
 #[derive(Clone, Debug, Deserialize)]
 pub(crate) struct PresentationForm {
     pub(crate) presentation_tag: String,