Add links to Gerrit v3.4.6 war and docs
Add links to Gerrit v3.4.6 war and docs

Change-Id: I02e1e01099c22658fc82c77a5ac9928d9b3194d2

GerritCodeReview/homepage,GerritCodeReview/homepage,GerritCodeReview/homepage,GerritCodeReview/homepage,GerritCodeReview/homepage