Docs: hid: intel-ish-hid: make long URL usable

Docs: hid: intel-ish-hid: make long URL usable

The '\' line continuation character in this long URL
doesn't help anything. There is no documentation tooling that
handles the line continuation character to join the 2 lines
to make a usable URL. Web browsers terminate the URL just
before the '\' character so that the second line of the URL
is lost. See:
  https://docs.kernel.org/hid/intel-ish-hid.html

Join the 2 lines together so that the URL is usable.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260321230934.435020-1-rdunlap@infradead.org>