[CMake] Documentation suggestion

[David Doria]

On this page:
http://www.cmake.org/cmake/help/cmake-2-8-docs.html

there are many "See XYZ" statements. E.g.

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else: Starts the else portion of an if block.

  else(expression)

See the if command.
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It would be very helpful if these were linked to the anchor of that
command, e.g.:

See the [if] command.

David