Include new standard macros in wiki syntax detailed help pages (#17847).

Contributed by Felix Schäfer.

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013378
add missing fixtures to Redmine::UserFieldFormatTest

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013379