Say 'App' not 'Application' on What's Crossplane page

I notice Vale recommends App rather than Application.

Signed-off-by: Nic Cope <[email protected]>

Author: negz

content/v2.0-preview/whats-crossplane/_index.md

@@ -66,9 +66,9 @@ extend Kubernetes with new custom resources.
 controller.** The controller is the software that reacts when a user calls the
 custom resource API.
 
-Say you want your control plane to serve an `Application` custom resource API.
-When someone creates an `Application`, the control plane should create a
-Kubernetes `Deployment` and a `Service`.
+Say you want your control plane to serve an `App` custom resource API. When
+someone creates an `App`, the control plane should create a Kubernetes
+`Deployment` and a `Service`.
 
 **If there's not already a controller that does what you want - and exposes the
 API you want - you have to write the controller yourself.**
@@ -78,8 +78,8 @@ flowchart TD
 user(User)
 
 subgraph control [Control Plane]
-  api(Application API)
-  controller[Your Application Controller]
+  api(App API)
+  controller[Your App Controller]
   deployment(Deployment API)
   service(Service API)
 end
@@ -101,7 +101,7 @@ flowchart TD
 user(User)
 
 subgraph control [Control Plane]
-  api(Application API)
+  api(App API)
 
   subgraph crossplane [Composition Engine]
     fn(Python Function)
@@ -181,7 +181,7 @@ flowchart TD
 user(User)
 
 subgraph control [Control Plane]
-  api(Application API)
+  api(App API)
 
   subgraph crossplane [Composition Engine]
     fn(Python Function)