fix typo (#1402)

found by [typos](https://github.com/crate-ci/typos)

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/1402
Co-authored-by: Jul Lang <jullanggit@proton.me>
Co-committed-by: Jul Lang <jullanggit@proton.me>

src/api/common/router_macros.rs

@@ -164,7 +164,7 @@ macro_rules! router_match {
         $query.$param.take().map(|param| param.into_owned())
     }};
     (@@parse_param $query:expr, query, $param:ident) => {{
-        // extract mendatory query parameter
+        // extract mandatory query parameter
         $query.$param.take()
             .ok_or_bad_request(
                 format!("Missing argument `{}` for endpoint", stringify!($param))