Adjust documentation of page.php to be accurate

 * Pages make up the scaffolding of the website and can often be reached via the page's

 * main navigation. They contain information that is not expected to cease its relevance

 * and should be kept up to date.

 * The publication date of a page is normally irrelevant, more interesting would be the date

 * of the last edit. In this template, we simply display no author names and no dates.

 * The publication date of a page is normally irrelevant, more interesting is the date

 * of the last edit, which we display. In this template, we display no author names.

 * 

 * Posts, on the other hand, have an (often implicit) expiration date and are expected to

 * cease to be relevant at some point in time. See single.php for more details.