On CTAN, the package named "Comprehensive" contains a version of The Comprehensive LaTeX Symbol List dated 09 November 2009. But the corresponding package on MiKTeX contains a version of the file from 3 January 2008. Why doesn't MiKTeX reflect the latest version on CTAN? Can this be fixed?
Your first question can only be answered by the MiKTeX maintainer Christian Schenk. You could report this issue on the MiKTeX Bug Tracker, which should answer your second question.
texdoc symbols, what version do you end up with? The same – Werner Nov 15 '12 at 2:303 January 2008, where I read “This document lists 4947 symbols”. In my portable TeX Live I have a version from9 November 2009, where I can read “This document lists 5913 symbols”. In the latter the TOC has links, in the former not. – Speravir Nov 15 '12 at 3:23