fix(docs): document link

[ryuujo1573]

This is a trivial patch to some doc.

Fixes: (A wrong URL)

Description The link is malformed as [text]([url_a](url_b)) which produces an <a> with href="%5Bhttps://cloud.google.com/code/docs/vscode/quickstart-k8s#installing%5D(https://cloud.google.com/code/docs/vscode/install#installing)".

Notes: I forget to follow conventional commit message when editing from GitHub webpage. Maybe a squashing merge would help to regularize the commit history.

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/