docs: add missing backticks in documentation

this improve readability of documentation.
enable associated clippy lint `doc_markdown`

src/api/admin/router_v1.rs

@@ -79,7 +79,7 @@ pub enum Endpoint {
 impl Endpoint {
 	/// Determine which S3 endpoint a request is for using the request, and a bucket which was
 	/// possibly extracted from the Host header.
-	/// Returns Self plus bucket name, if endpoint is not Endpoint::ListBuckets
+	/// Returns Self plus bucket name, if endpoint is not `Endpoint::ListBuckets`
 	pub fn from_request<T>(req: &Request<T>) -> Result<Self, Error> {
 		let uri = req.uri();
 		let path = uri.path();