[docs] broken link to "see also: request instances"

[jakkdl]

If you go to https://www.python-httpx.org/api/#client, scroll down to the documentation for build_request (being able to directly link the method would be nice...), and try to click on "See also: Request instances" you're hit with an error 404.

build_request(self, method, url, *, content=None, data=None, files=None, json=None, params=None, headers=None, cookies=None, timeout=, extensions=None)

Build and return a request instance.

The params, headers and cookies arguments are merged with any values set on the client.
The url argument is merged with any base_url set on the client.

See also: Request instances

Skipping creating a discussion over this, as clearly you don't want broken links in your docs.

[alexdlukens]

Looks like the links were corrected in #3123 on Feb 29, but the docs have not been rebuilt since Feb 21 (#3095). A redeploy of the docs should fix this