docs(cacheLife): fix incorrect highlight and missing `switcher` (#72216)
This PR fixes two issues on the
[cacheLife](https://nextjs.org/docs/canary/app/api-reference/functions/cacheLife)
documentation page:
1. Incorrect highlight for `biweekly` in [Defining reusable cache
profiles](https://nextjs.org/docs/canary/app/api-reference/functions/cacheLife#defining-reusable-cache-profiles)
section. It should highlight `biweekly` but not `export default async
function Page()`

2. Missing `switcher` for TS and JS codeblock in [Defining cache
profiles
inline](https://nextjs.org/docs/canary/app/api-reference/functions/cacheLife#defining-cache-profiles-inline)
section. Codeblock is displayed twice

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Co-authored-by: Jiwon Choi <devjiwonchoi@gmail.com>