Improve clarity and grammar in installation section

[Sudarshan-Raut]

Improved grammar, formatting, and readability in installation instructions.

Fixes #0000

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

[welcome]

Thanks for opening this pull request! This space is protected by our Code of Conduct - and we're here to help.
Dangerbot will test out your code and reply in a bit with some pointers and requests.
Also please refer here for installation help 💿
There may be some errors, but don't worry! We'll work through them with you! 👍🎉😄


One thing that can help to get started is to make sure you've included a link back to the original issue you're solving, in the format fixes #0000 (for example). And to make sure the PR title describes what you're trying to do! (often it can be the same as the issue title) Thanks! 🙌


Then, you can say hello in our chatroom & share a link to this PR to get a review! 👋 ✅