Document the implicit inputs in ModuleInfo's Javadoc

This is hopefully the most logical place.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

src/main/java/org/scijava/module/ModuleInfo.java

@@ -40,6 +40,11 @@
  * A ModuleInfo object encapsulates metadata about a particular {@link Module}
  * (but not a specific instance of it). In particular, it can report details on
  * the names and types of inputs and outputs.
+ * <p>
+ * A special class of implicit input parameters is available: when the
+ * {@code name} starts with a dot (e.g. {@code .helloWorld}), no warning is
+ * issued about an unmatched input.
+ * </p>
  * 
  * @author Aivar Grislis
  * @author Curtis Rueden