Change Twitter handle from @angularjs to @angular

[CBedzz]

Update docs with Angular twitter handle from older Angular Team.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
docs

What is the current behavior? (You can also link to an open issue here)
Uses older @angularjs (Angular Team) twitter handle.

What is the new behavior (if this is a feature change)?
Uses newer @angular (Angular) twitter handle.

Does this PR introduce a breaking change?
no

Please check if the PR fulfills these requirements

• [x ] The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

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[gkalpak]

👍
Please make sure you have signed the CLA (or we won't be able to merge this).

[CBedzz]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!