Unclear how to upgrade

[pwright]

Having installed 1.5.2 cli but keeping the 1.4.4 cli available :

$ skupper1.4.4 version
client version                 1.4.4
transport version              quay.io/skupper/skupper-router:2.4.3 (sha256:7d33d51ee6ae)
controller version             quay.io/skupper/service-controller:1.4.4 (sha256:55c7e04b4ff7)
config-sync version            quay.io/skupper/config-sync:1.4.4 (sha256:3b7e81fc45bd)
flow-collector version         not-found
[pwright@fin-p1 ~]$ skupper update
Skupper is now updated in 'pwright-dev'.
[pwright@fin-p1 ~]$ skupper status
Detected that the skupper version installed in the namespace is version 1.4.4. The CLI requires version 1.5.0. To update the installation, please follow the instructions found here: https://skupper.io/docs/index.html

After a few minutes, issued the command again and the site had upgraded.

The link to docs won't help user as all install docs are now centralized to skupper.io/install.

created https://github.com/skupperproject/skupper/pull/1347 to address

I think we should also follow up in the install doc to say that updating isn't instant.