[rocm-libraries] ROCm/rocm-libraries#4431 (commit ca33816)

[CK] updated github repo link (#4431)

The location of the github repo has changed; the landing page of the
docs needs to reflect this.

Updated only the git repo links in the docs folder.

Also added info to the install doc about how to do a sparse checkout.

Updated some refs that were messed up while I was at it.

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Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>