fixed typo / grammer in faq and quick start pages

[JagadishPrasadSanaka]

Description of your changes

Fixes #1321 : Submitting pull request to corrected typo and grammar errors.

I have:

• [X] Read and followed KubeVela's contribution process.
• [ ] Update sidebar.js if adding a new page.
• [X] Run yarn start to ensure the changes has taken effect.

Special notes for your reviewer

• Fixed both "docs" & "versioned_docs" for 1.9 version.