[Docs] Tutorials/Learn

[Rajakavitha1]

Worked on the content in the learn section to check for redundant and updated the Deployment with Provision a Backend.

Description: Please include the following in your PR description:

1. A brief, clear description of the change.
2. Link to any related PRs or discuss.dgraph.io posts.
3. If this PR corresponds to a JIRA issue, include "Fixes DOC-###" in the PR description.
4. If this is a breaking change, please put "[Breaking]" in the title. In the description, please put a note with exactly who these changes are breaking for.
5. If you are creating a PR in main and you know it needs to be cherry-picked to a release branch, please mention that in your PR description (for example: "cherry-pick to v20.07"). Cherry-pick PRs should reference the original PR.

Note: Create and edit docs in the main branch when you can, so that we only cherry-pick out of main, not into main.
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