Wrong class names in advanced help

Some of the help pages still have the old context class names:

required contexts: [Optional] Either a ctools_required_context or ctools_optional_context or array of contexts for this content. If omitted, no contexts are required.

Also, it seems that "required contexts" (plural) should be "required context" (singular), even if it's an array.

(From help/context-content.html line 62).