[cmake-developers] FindThreads module documentation needs some work

[Alan W. Irwin]

I have [opened an issue on the bugtracker](https://gitlab.kitware.com/cmake/cmake/issues/19823) concerning this documentation bug.

Alan
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Alan W. Irwin

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.org); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
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Linux-powered Science
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