Updated installation steps for litmus

[Saranya-jena]

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Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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Checklist:

• [ ] Fixes #
• [ ] Signed the commit for DCO to be passed
• [ ] Labelled this PR & related issue with documentation tag

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