Fixed documentation for portal implementation. Pay attention to mentios of $jump that I rewrote to $jump->(). I didn't test it but I believe it to be the right way.
Revert "Fixed documentation for portal implementation. Pay attention to mentios of $jump that I rewrote to $jump->(). I didn't test it but I believe it to be the right way."

This reverts commit ef29ce35a4422971a88fbfc62f381ec1b7d8022b.
Some changes to documentation.
Merge pull request #2 from eroot/master

Some changes to documentation