From Paul Benedict on javadoc-dev:

If you look at the types that have @Documented annotations, the first annotation is correctly left-aligned but all others are indented by one space. If this is already reported, my apologies; if not, please confirm.
 
Example:
http://download.java.net/jdk8/docs/api/java/lang/FunctionalInterface.html

This is very low-hanging fruit, but I think this is a bug. The latest (b116) is still indenting wrong and it's been this way since around b111.

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Cheers,
Paul