Remove "popup windows" from summary of content.

[P-v-K]

The words "popup" and "windows" only appear on the summary line, and there seems to currently be no mention of either in the content.

[arturoc]

mmh, the utils module really has some utilities for popup windows. The problem here seems really that the content should mention those not that the title shouldn't.

I think it's better to leave it as it is, that way someone might contribute documentation for that missing part.

Thanks!