gpui: Fix intra rustdoc links (#37320)

The only warnings remaining are links to private modules/items, but I
lack knowledge to work out if the referenced modules/items should be
made public, or if the links should be rewritten into exposed
traits/items.

Links to associated items such as trait implementations have to be
written using full markdown format such as:

... [[ `App::update_global` ]](( BorrowAppContext::update_global ))

This is due to https://github.com/rust-lang/rust/issues/74563 which
sadly prohibits fully-qualified syntax:

... [[ `<App as BorrowAppContext>::update_global` ]]

Release Notes:

- N/A

Probably related to https://github.com/zed-industries/zed/pull/37072

crates/util/src/schemars.rs

@@ -7,7 +7,7 @@ const DEFS_PATH: &str = "#/$defs/";
 ///
 /// This asserts that JsonSchema::schema_name() + "2" does not exist because this indicates that
 /// there are multiple types that use this name, and unfortunately schemars APIs do not support
-/// resolving this ambiguity - see https://github.com/GREsau/schemars/issues/449
+/// resolving this ambiguity - see <https://github.com/GREsau/schemars/issues/449>
 ///
 /// This takes a closure for `schema` because some settings types are not available on the remote
 /// server, and so will crash when attempting to access e.g. GlobalThemeRegistry.

crates/util/src/util.rs

@@ -329,7 +329,7 @@ pub fn load_login_shell_environment() -> Result<()> {
 /// Configures the process to start a new session, to prevent interactive shells from taking control
 /// of the terminal.
 ///
-/// For more details: https://registerspill.thorstenball.com/p/how-to-lose-control-of-your-shell
+/// For more details: <https://registerspill.thorstenball.com/p/how-to-lose-control-of-your-shell>
 pub fn set_pre_exec_to_start_new_session(
     command: &mut std::process::Command,
 ) -> &mut std::process::Command {