HW Relnotes: Improve gve

Allow searching "Google Cloud" or "GCE" in the Hardware Release Notes.

Reviewed by: mhorne
Reviewed by: Jasper Tran O'Leary <jtranoleary@google.com>
Reviewed by: Vee Agarwal <jtranoleary@google.com>
Approved by: mhorne (mentor)
Differential Revision: https://reviews.freebsd.org/D50525