3.0 core libraries proof

Another set of proofing changes. I'll go through the rest of `/core-libraries` next.
"options" or "htmlOptions" now?
https://github.com/cakephp/docs/pull/1530/files#diff-8ef280384f8ee99efb44635a996329e8R17
https://github.com/cakephp/docs/pull/1530/files#diff-8ef280384f8ee99efb44635a996329e8R38
:confused: