Fix soy template in docs, remove leading dot

When running on Gerrit version 3.11.1, the leading dot in
"{template .link}" produces the error "parse error at '.':
expected identifier". Removing the dot makes the template
work again. This patch updates the template in the its-jira
documentation.

Change-Id: Id598b6bc7b2347cd11d207ba46c99870371df3ca
1 file changed