[DOC] Use the right version for ONAP Frankfurt

The version given for Frankfurt version is not the right one. So we fix
it with this commit.

Issue-ID: OOM-2424
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I9e24f0b15d821904e70d758a978c2979a530adf0
1 file changed