Added or updated screenshots

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1438215 13f79535-47bb-0310-9956-ffa450edef68
Added missing changes
Fixed typo in changes
Added screenshots for somes

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1438217 13f79535-47bb-0310-9956-ffa450edef68
Missing Test Plan

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1438218 13f79535-47bb-0310-9956-ffa450edef68
Merge Philippe's changes in docs after RC3 into docs-2.9 tags



git-svn-id: https://svn.apache.org/repos/asf/jmeter/branches/docs-2.9@1439628 13f79535-47bb-0310-9956-ffa450edef68