docs: cargo features (#3527)

* dialog

* fs

* geolocation

* haptic

* log

* single instance

* notification

* updater

* ##

* persisted scopes

* stronghold

* sql

* upload

* websocket

* http
(this one was too long that I generated through codex, didn't review yet)

* add change file

* no persisted-scope-js

* add `://`

* Merge branch 'v2' into document-cargo-features

* update system-proxy docs

* finish http docs

* notification doesn't need version bumps

* clean up docs

plugins/dialog/src/lib.rs

@@ -3,6 +3,11 @@
 // SPDX-License-Identifier: MIT
 
 //! Native system dialogs for opening and saving files along with message dialogs.
+//!
+//! ## Cargo features
+//!
+//! - **gtk3** *(enabled by default)*: Uses GTK for dialogs on Linux & BSDs; has no effect on Windows and macOS
+//! - **xdg-portal**:  Uses XDG Desktop Portal instead of GTK on Linux & BSDs
 
 #![doc(
     html_logo_url = "https://github.com/tauri-apps/tauri/raw/dev/app-icon.png",