clarify documentation for outerWidth and outerHeight

[IanKemp]

Fixes #882.

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[IanKemp]

I signed the CLA, plzkthx.

[AurelioDeRosa]

The PR looks good to me but it seems there are still problems with the CLA.

[IanKemp]

I don't know what's up with the CLA. I signed it but the "check CLA status" link doesn't work.

[agcolom]

@IanKemp the issue with the CLA is that there is a mismatch with your email address. You signed the CLA with your gmail address, but the PR is associated with another email address, see https://patch-diff.githubusercontent.com/raw/jquery/api.jquery.com/pull/883.patch
If you sign again with your name and that email address, it'll be all green :-) thanks :-)

[IanKemp]

Ugh, my repo was setup with my work email address instead of my personal. Signed the CLA with the former, seems fine now, sorry for the trouble.

[agcolom]

@IanKemp No worries at all and thanks very much for signing again and the PRs :-)

[AurelioDeRosa]

Merged. Thank you @IanKemp.