Repository: kubernetes-sigs/kubebuilder (language: go)

Issue:
Suggesting a small improvement to docs quickstart section
### What do you want to happen?

I started reading the kubebuilder book and noticed that this paragraph on the `quickstart` section could be improved

```
If you pressed y for Create Resource [y/n] then you created an (CR)Custom Resource for your (CRD)Custom Resource Definition in your samples (make sure to edit them first if you’ve changed the API definition):
```

1. I'm wondering why it's (CR)Custom Resource instead of Custom Ressource (CR), same for CRD
2. CR and CRD have already been mentioned further up in this document without an explanation, I believe that abreviations should be explained on first mention.
3. I think it should be a Custom Resource not an, but I am not a native speaker so I might be wrong here

If you agree that this should be changed I would be very happy to make a PR for that. 
PS: I wasn't sure if this is a feature request or a bug report, but the template for bug reports seemed overwhelming for such a small change, so I went with a feature request instead.

### Extra Labels

/kind documentation


Discussion / hints:

Fix patch:
diff --git a/docs/book/src/quick-start.md b/docs/book/src/quick-start.md
index a780a266b7c..7f6fe229bc4 100644
--- a/docs/book/src/quick-start.md
+++ b/docs/book/src/quick-start.md
@@ -93,7 +93,7 @@ and the `controllers/guestbook_controller.go` where the reconciliation business
 logic. For more info see [Designing an API](/cronjob-tutorial/api-design.md) and [What's in
 a Controller](cronjob-tutorial/controller-overview.md).
 
-If you are editing the API definitions, generate the manifests such as CRs or CRDs using
+If you are editing the API definitions, generate the manifests such as Custom Resources (CRs) or Custom Resource Defintions (CRDs) using
 ```bash
 make manifests
 ```
@@ -178,7 +178,7 @@ make run
 
 ## Install Instances of Custom Resources
 
-If you pressed `y` for Create Resource [y/n] then you created an (CR)Custom Resource for your (CRD)Custom Resource Definition in your samples (make sure to edit them first if you've changed the
+If you pressed `y` for Create Resource [y/n] then you created a CR for your CRD in your samples (make sure to edit them first if you've changed the
 API definition):
 
 ```bash


Test patch: