Fix installation docs

[phanikumv]

Describe the bug Modify the installation docs as per this link(https://astronomer.slack.com/archives/C02B8SPT93K/p1674851503366939)

Version

• Astro: [e.g. 0.6.0]
• OS: [eg. Debian]

To Reproduce Steps to reproduce the behavior:

1. Write the DAG '...'
2. Create connection '....'
3. Run using '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Additional context Add any other context about the problem here.