Document bevy_gizmos feature

Author: tim-blackbird

Cargo.toml

@@ -98,6 +98,8 @@ bevy_ui = ["bevy_internal/bevy_ui"]
 
 # winit window and input backend
 bevy_winit = ["bevy_internal/bevy_winit"]
+
+# Adds support for rendering gizmos
 bevy_gizmos = ["bevy_internal/bevy_gizmos"]
 
 # Tracing support, saving a file in Chrome Tracing format