Update banner descriptions, fix minor errors, and update UI text.

Created by: serenashe

Signed-off-by: serenashe serenashe@yunify.com

What type of PR is this?

/kind documentation

What this PR does / why we need it:

I update some banner descriptions, fix minor errors, and update UI text.

none

There're no source code changes in this PR. Please take a look, thanks. /assign @harrisonliu5