doc: remove Docker Hub from container install sources

As posted at https://hub.docker.com/r/ceph/ceph:

"As of August 2021, new container images are pushed to quay.io registry only.
Docker hub won't receive new content for that specific image but
current images remain available."

diff --git a/doc/install/containers.rst b/doc/install/containers.rst
index 936be0be0a200217c831781e2acb9b339d439613..7e73c73edea342788566662d209cd81755291726 100644 (file)
--- a/doc/install/containers.rst
+++ b/doc/install/containers.rst
@@ -19,10 +19,9 @@ Ceph Container Images
 Official Releases
 -----------------
 
-Ceph Container images are available from both Quay and Docker Hub::
+Ceph Container images are available from Quay::
 
   https://quay.io/repository/ceph/ceph
-  https://hub.docker.com/r/ceph
 
 ceph/ceph
 ^^^^^^^^^