Fix markdown in 2.13 release notes
Fix markdown in 2.13 release notes

Change-Id: I11a290cbbb9dd8f9a6b3a12c2e7626bbfce8d86e

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