update "operator-sdk run bundle" usage (#5210)

* update "operator-sdk run bundle" usage

Adding "docker registry host" in operator-sdk run bundle argument

Signed-off-by: akihikokuroda <[email protected]>

* Update quickstart.md

Same way as tutorial.md

Signed-off-by: akihikokuroda <[email protected]>

Author: akihikokuroda

website/content/en/docs/building-operators/golang/quickstart.md

@@ -59,7 +59,7 @@ This guide walks through an example of building a simple memcached-operator usin
 has a custom CA, these [configuration steps][image-reg-config] must be complete.
 
   ```sh
-  operator-sdk run bundle example.com/memcached-operator-bundle:v0.0.1
+  operator-sdk run bundle <some-registry>/memcached-operator-bundle:v0.0.1
   ```
 
 1. Create a sample Memcached custom resource: