Javadoc: Use the active voice.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636203 13f79535-47bb-0310-9956-ffa450edef68
Fixes for Javadoc 8.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636204 13f79535-47bb-0310-9956-ffa450edef68
Fixes for Javadoc 8.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636205 13f79535-47bb-0310-9956-ffa450edef68