[CMake] Requested documentation tweak

[Alan W. Irwin]

I just noted in passing that "item" should be changed to "items" in the
following documentation paragraph for LIST

        REMOVE_AT and REMOVE_ITEM will remove item from the list.  The
        difference is that REMOVE_ITEM will remove the given items, while
        REMOVE_AT will remove the item at the given indices.

==>

        REMOVE_AT and REMOVE_ITEM will remove items from the list.  The
        difference is that REMOVE_ITEM will remove the given items, while
        REMOVE_AT will remove the items at the given indices.

With such terse phraseology (which is a good thing) the effect of such
plural/singular problems becomes magnified.  Thus, this fix makes the
meaning much clearer.

I hope some responsible CMake developer will immediately take about 10
seconds to make this documentation fix in CVS.

Alan
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Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.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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