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Doc custom CameraProjection requires use of plugin (#13140)

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# Objective

Documentation should mention the two plugins required for your custom
`CameraProjection` to work.

## Solution

Documented!

---

I tried linking to `bevy_pbr::PbrProjectionPlugin` from
`bevy_render:📷:CameraProjection` but it wasn't in scope. Is there
a trick to it?
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crates/bevy_render/src/camera/projection.rs
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@ -70,6 +70,9 @@ pub struct CameraUpdateSystem;
/// to recompute the camera projection matrix of the [`Camera`] component attached to
/// the same entity as the component implementing this trait.
///
/// Use the plugins [`CameraProjectionPlugin`] and `bevy::pbr::PbrProjectionPlugin` to setup the
/// systems for your [`CameraProjection`] implementation.
///
/// [`Camera`]: crate::camera::Camera
pub trait CameraProjection {
fn get_projection_matrix(&self) -> Mat4;