fix typo

related to #5128

with help of ##English on freenode :)

fixes #5244

just fixed typo

In line 180. 
It should be .val() instead of .value.

This is my first edit.

Add comment to documentation sample code for GridView

fixes #2593

- We do not generate static pages in controllers, but merely output them.
- We need to say that the data is needed to be plainly put into the view, as the reader might expect something more sophisticated to happen here.

registerMetaTag() usage clarification

We should note that the application is the global module itself, otherwise the paragraph can hardly be understood by someone unfamiliar with yii architecture.

Above/below code reference fix

The method 'bar()' does not exist in this context. I believe it should be 'foo().'