Lambda parameters and return value docs don't work for cpp,swift and dart.

[limingchina]

Currently, with the following input:

package test

class CommentsLambda {
    // This is a comment for lambda 
    // @param[p0] This is the comment for the first parameter of the lambda.
    // @param[p1] This is the comment for the second parameter of the lambda.
    lambda MyCallback = (@Java("param1_name") Int?, @Java("param2_name") String) 
        ->  /*Comment for return value*/ Int
} 

The documentation for parameters will not appear in the generated documentation for the lambda. The comment for the return value will lead to a lime file loading error since the syntax is not supporting documenting the return value.