Add alt-texts to images in screenshots and figures
Add alt-texts to images in screenshots and figures

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1664844 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: b43fd610ffde1a29d106c519969ba5cdf4b8b1d0
etnetera/jmeter,benbenw/jmeter,etnetera/jmeter,apache/jmeter,ham1/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,benbenw/jmeter,etnetera/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter,apache/jmeter