#3768 Replace installation instructions for pytorch operator with training operator Pull request opened by fg91 Describe your changes This PR updates the installation instructions accordingly. For the tensorflow operator this was already documented correctly. I copied the installation instructions from there. The kubeflow pytorch operator has been deprecated in favor of the new training operator. ☑︎ I updated the documentation accordingly. ☐ All new and existing tests passed. ☑︎ All commits are signed-off. flyteorg/flyte ✅ All checks have passed 6/6 successful checks