Support just jsdoc tags without method descriptions

Let the examples speak for themselves

``` js
/** @method add */
function add(a, b) { return a + b; }

/** @sample add */
it('adds numbers', function () {
lazyAss(add(2, 3) === 5);
lazyAss(add(2, -3) === -1);
});
```

Right now we require at least single method description to generate doc

Start by locating the code that requires a method description before generating documentation, then find any tests or examples covering @method and @sample tags. Done means the shown JavaScript example generates documentation without a method description.

Written by the indexing model from the issue text.