Bug 1456323 - Document color-adjust

[jmswisher]

See https://bugzilla.mozilla.org/show_bug.cgi?id=1456323, which was filed to represent mdn/data#212

[a2sheppy]

Content changes are done. BCD PR is submitted. Interactive example is done but a commit error is preventing the PR from being submitted. Should be resolved soon.

[a2sheppy]

Submitted mdn/interactive-examples#1008 with interactive example for color-adjust.

[jwhitlock]

The ZenHub plugin includes a way to link a pull request to an issue, I've added this link.

[jwhitlock]

Sorry, did not mean to close the issue.