Fix the Djblets instructions in the release notes to use the 1.0 path.
Fix the Djblets instructions in the release notes to use the 1.0 path.

The release notes specified the old 0.10 path for the search paths for
Djblets for the 3.0 RC 1 release. This fixes that to use the 1.0 path
instead.

chipx86/reviewboard,chipx86/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,reviewboard/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,reviewboard/reviewboard