docs: add missing backticks in documentation

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

src/api/admin/router_v0.rs

@@ -77,7 +77,7 @@ 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();

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();

src/api/admin/router_v2.rs

@@ -15,7 +15,7 @@ use crate::Authorization;
 impl AdminApiRequest {
 	/// 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 async fn from_request(req: Request<IncomingBody>) -> Result<Self, Error> {
 		let uri = req.uri().clone();
 		let path = uri.path();