Fix broken internal links, keep zh links in-locale, and clarify fern export - #6543

Fix broken internal links, keep zh links in-locale, and clarify fern export#6543

ctondreau wants to merge 2 commits into

mainfern-api/docs:mainfrom

fix/docs-feedback-broken-learn-linksfern-api/docs:fix/docs-feedback-broken-learn-linksCopy head branch name to clipboard