Fix some links in documentation

ruma-client-api/src/r0/user_directory/search_users.rs

@@ -29,7 +29,7 @@ ruma_api! {
         ///
         /// See [MDN] for the syntax.
         ///
-        /// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language#Syntax
+        /// [MDN]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language#Syntax
         #[ruma_api(header = ACCEPT_LANGUAGE)]
         pub language: Option<String>,
     }

ruma-common/src/push/action.rs

@@ -6,7 +6,7 @@ use serde_json::value::RawValue as RawJsonValue;
 /// This represents the different actions that should be taken when a rule is matched, and
 /// controls how notifications are delivered to the client.
 ///
-/// See https://matrix.org/docs/spec/client_server/r0.6.0#actions for details.
+/// See <https://matrix.org/docs/spec/client_server/r0.6.0#actions> for details.
 #[derive(Clone, Debug)]
 #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
 pub enum Action {

ruma-events/src/room/relationships.rs

@@ -4,7 +4,7 @@
 //! adds types to parse the relationship of an event if any exists.
 //!
 //! MSC for all the relates_to types except replies:
-//!     https://github.com/matrix-org/matrix-doc/pull/2674
+//! <https://github.com/matrix-org/matrix-doc/pull/2674>
 
 use ruma_identifiers::EventId;
 use serde::{Deserialize, Serialize};

ruma-identifiers/src/macros.rs

@@ -1,6 +1,6 @@
 /// Declares an item with a doc attribute computed by some macro expression.
 /// This allows documentation to be dynamically generated based on input.
-/// Necessary to work around https://github.com/rust-lang/rust/issues/52607.
+/// Necessary to work around <https://github.com/rust-lang/rust/issues/52607>.
 macro_rules! doc_concat {
     ( $( #[doc = $doc:expr] $( $thing:tt )* )* ) => ( $( #[doc = $doc] $( $thing )* )* );
 }

ruma-serde/src/lib.rs

@@ -59,7 +59,7 @@ pub fn is_true(b: &bool) -> bool {
 ///
 /// To be used like this:
 /// `#[serde(deserialize_with = "empty_string_as_none")]`
-/// Relevant serde issue: https://github.com/serde-rs/serde/issues/1425
+/// Relevant serde issue: <https://github.com/serde-rs/serde/issues/1425>
 pub fn empty_string_as_none<'de, D, T>(de: D) -> Result<Option<T>, D::Error>
 where
     D: serde::Deserializer<'de>,