Document the hosted klusterlet setup

[rolandkool]

Describe the enhancement

Running Klusterlet in hosted mode is not very well documented. There are some hints to be found here:
https://github.com/open-cluster-management-io/registration-operator#deploy-spokeklusterlet-with-hosted-mode
open-cluster-management-io/clusteradm#289

This feature deserves a proper mention in the official installation documentation

[zhujian7]

/assign

[zhujian7]

@rolandkool I added some doc for running Klusterlet in hosted mode, https://open-cluster-management.io/getting-started/installation/register-a-cluster/#bootstrap-a-klusterlet-in-hosted-modeoptional

will close this issue first, feel free to reopen it if something is unclear.
/close

[openshift-ci]

@zhujian7: Closing this issue.

In response to this:

@rolandkool I added some doc for running Klusterlet in hosted mode, https://open-cluster-management.io/getting-started/installation/register-a-cluster/#bootstrap-a-klusterlet-in-hosted-modeoptional

will close this issue first, feel free to reopen it if something is unclear.
/close

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