Correct example for filter date/'fullDate' in documentation

Request Type: docs

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**Detailed Description:**

On the following docs page there is a missing space in giving the equivalent expanded filter for the shortform 'fullDate' filter.

https://docs.angularjs.org/api/ng/filter/date

It gives the equivalent as this:
`'fullDate': equivalent to 'EEEE, MMMM d,y' for en_US locale (e.g. Friday, September 3, 2010)`
Whereas it should be:
`'fullDate': equivalent to 'EEEE, MMMM d, y' for en_US locale (e.g. Friday, September 3, 2010)`

Notice the space between the `d,` and `y`. A very small issue, but probably worth fixing!

**Other Comments:**

The equivalent expanded example for 'fullDate' is given as 'EEEE, MMMM d,y' whereas it should be 'EEEE, MMMM d, y' e.g. I added the correct whitespace to the expanded example.