docs: fix the link of `.eslintrc.js` and the link of `.prettierrc`

Created by: mangoGoForward

What type of PR is this?

/kind bug

What this PR does / why we need it:

The link of .eslintrc.js and the link of .prettierrc would jump to 404 error page, this PR try to solve it

Which issue(s) this PR fixes:

Fixes #2496 (closed)

Does this PR introduced a user-facing change?

fix of a previous Known Issue