Typo "siteurl" in network.php

[tobifjellner]

Hi
In wp-admin/includes/network.php around line 271 there's a string that writes word "siteurl" as one word where is should probably be split into two. The full string is:

We recommend you change your siteurl to %1$s before enabling the network feature. It will still be possible to visit your site using the %3$s prefix with an address like %2$s but any links will not have the %3$s prefix.

Reported by: @ramiy

[kharisblank]

Fix siteurl string

[SergeyBiryukov]

Thanks for the ticket and the patch!

For some context, this message is displayed when the site domain includes www. It refers to the siteurl option, labeled as "WordPress Address (URL)" in General Settings.

Changing this to "site URL" or "site domain" (since it refers to the domain, not the full URL) seems fine at a glance.

[SergeyBiryukov]

In 47085:

Networks and Sites: Clarify the recommendation to remove the www prefix from the site domain before creating a network.

The siteurl option reference was not quite clear, and the string actually refers to the domain name, not the full URL.

Props kharisblank, tobifjellner, ramiy.
Fixes #49214.