BZ2117171 fix typo in image sstream doc

Author: ShaunaDiaz

modules/images-imagestream-use.adoc

@@ -19,7 +19,7 @@ image.
 The source images can be stored in any of the following:
 
 * {product-title}'s integrated registry.
-* An external registry, for example registry.redhat.io or Quay.io.
+* An external registry, for example registry.redhat.io or quay.io.
 * Other image streams in the {product-title} cluster.
 
 When you define an object that references an image stream tag, such as a build or deployment configuration, you point to an image stream tag and not the repository. When you build or deploy your application, {product-title} queries the repository using the image stream tag to locate the associated ID of the image and uses that exact image.