Documentation: WP_HTTP timeout is a float, not an int.

[georgestephanis]

As demonstrated in Core since [10474] timeout hasn't been an int.

The Requests library also documents it as a float, with millisecond precision:

https://core.trac.wordpress.org/browser/trunk/src/wp-includes/class-requests.php?rev=46661#L309

Patch attached.

[georgestephanis]

Thanks to @benedictsinger for spotting this at a meetup and asking why we were passing a float to an int parameter. :)

[georgestephanis]

Docs tracks back to [29230]

[SergeyBiryukov]

In 46970:

Docs: Correct @type for timeout argument in WP_Http::request().

Props georgestephanis, benedictsinger.
Fixes #49005.