Update instructions for DataScienceCluster to reflect API update to v1

[VaishnaviHire]

DataScienceCluster API was updated to v1, since the last ODH release. Update the documentation to reflect this and remove references of the previous api vesion for ODH 1.10 release.

Ref : opendatahub-io/opendatahub-operator#502

[zdtsw]

can assign this to me, i have cluster up, will be easy to make screenshot