fix Zend_View_Abstract::__get() phpdoc

[staabm]

as discussed in phpstan upstream issue phpstan/phpstan#3927 (comment)

to access variables from within a controller via $this->view without a phpstan error, this phpdoc needs to be fixed.

[glensc]

LGTM.

but note for the future. try to explain the whole context in PR title/body, so the reviewer doesn't have to click links and figure out what did the pull request creator had in mind when they added the link.

ps: cross-linking stuff, is very okay.

[falkenhawk]

Thank you @staabm !