Javadoc compilation errors

[gracegrimwood]

At AvrInstruction.java:428 the parameter name specified is incorrect, and thus Eclipse throws an error when compiling Javadoc. The correct param is "opcode" as "format" is not a parameter for the method toMask.

[gracegrimwood]

I've just tried to compile the rest of the code's Javadoc, and found a few more issues of a similar nature. In addition to the one above, Wire.java:22, Wire.java:30, DecoderGenerator.java:215, AvrEncodingTests.java:72, and AvrEncodingTests.java:130 all have the same issues of incorrect parameter names, and AVR.java:129 and AbstractSerialPeripheral.java:134 have @return's where there should be none.