ignore legion and glam tests. don't run intro example as doc test

Cargo.toml

@@ -31,6 +31,10 @@ members = [
     "crates/*",
     "examples/app/dynamic_plugin_loading/example_plugin"
 ]
+exclude = [
+    "crates/bevy_glam",
+    "crates/bevy_legion"
+]
 
 [dependencies]
 # bevy

src/lib.rs

@@ -8,7 +8,7 @@
 //!
 //! ## Example
 //!Here is a simple "Hello World" Bevy app:
-//! ```
+//! ```no_run
 //!use bevy::prelude::*;
 //!
 //!fn main() {