Changed occurrences of gerrit.openbmc-project.xyz

After updates Gerrit is now hosted at https://gerrit.openbmc.org

.
Urls in the documentation are now updated to reflect this change.

Signed-off-by: Corey Hardesty <corey.hardesty@icloud.com>
Change-Id: I3a7f7d338ca1ce600ccf7b41fa03bd62007925ba