docs: fix pip cmd.

[GdoongMathew]

What does this PR do?

Fixes pip cmd in README.md

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📚 Documentation preview 📚: https://pytorch-lightning--21242.org.readthedocs.build/en/21242/

[deependujha]

Hi @GdoongMathew, thanks for the PR.

We can land this PR only after approval from Will or Luca. It'll be better to update branch only when we have sufficient approval to get it landed.

[GdoongMathew]

Hi @GdoongMathew, thanks for the PR.

We can land this PR only after approval from Will or Luca. It'll be better to update branch only when we have sufficient approval to get it landed.

Hi @deependujha, thanks for the update! I’ll wait for the approval then.