Fixes to the Animating a Blur article (#8052)
Fixes to the Animating a Blur article (#8052)

In the *Animating a Blur* article,

- Added missing commas.
- Replaced a colon with a period at the end of a sentence.
- Added a missing opening quote.
- Changed "your GitHub repository" to "our GitHub repository" when referring to the `GoogleChromeLabs/ui-element-samples` repository.
lucab85/WebFundamentals,myakura/WebFundamentals,myakura/WebFundamentals,myakura/WebFundamentals,google/WebFundamentals,myakura/WebFundamentals,lucab85/WebFundamentals,google/WebFundamentals,lucab85/WebFundamentals,lucab85/WebFundamentals,google/WebFundamentals,google/WebFundamentals