Add .pmd to svn:ignore.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/primitives/trunk@1612044 13f79535-47bb-0310-9956-ffa450edef68
Use the more modern, compact, and flexible Javadoc "{@code ...}" instead of the HTML "<tt>...</tt>".

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/primitives/trunk@1612045 13f79535-47bb-0310-9956-ffa450edef68