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docs: spack does not have a variant debug for libelf (#23021)

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Signed-off-by: vsoch <vsoch@users.noreply.github.com>

Co-authored-by: vsoch <vsoch@users.noreply.github.com>
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lib/spack/docs/basic_usage.rst
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@ -963,7 +963,7 @@ Variants are named options associated with a particular package. They are
optional, as each package must provide default values for each variant it optional, as each package must provide default values for each variant it
makes available. Variants can be specified using makes available. Variants can be specified using
a flexible parameter syntax ``name=<value>``. For example, a flexible parameter syntax ``name=<value>``. For example,
``spack install libelf debug=True`` will install libelf built with debug ``spack install mercury debug=True`` will install mercury built with debug
flags. The names of particular variants available for a package depend on flags. The names of particular variants available for a package depend on
what was provided by the package author. ``spack info <package>`` will what was provided by the package author. ``spack info <package>`` will
provide information on what build variants are available. provide information on what build variants are available.
@ -971,11 +971,11 @@ provide information on what build variants are available.
For compatibility with earlier versions, variants which happen to be For compatibility with earlier versions, variants which happen to be
boolean in nature can be specified by a syntax that represents turning boolean in nature can be specified by a syntax that represents turning
options on and off. For example, in the previous spec we could have options on and off. For example, in the previous spec we could have
supplied ``libelf +debug`` with the same effect of enabling the debug supplied ``mercury +debug`` with the same effect of enabling the debug
compile time option for the libelf package. compile time option for the libelf package.
Depending on the package a variant may have any default value. For Depending on the package a variant may have any default value. For
``libelf`` here, ``debug`` is ``False`` by default, and we turned it on ``mercury`` here, ``debug`` is ``False`` by default, and we turned it on
with ``debug=True`` or ``+debug``. If a variant is ``True`` by default with ``debug=True`` or ``+debug``. If a variant is ``True`` by default
you can turn it off by either adding ``-name`` or ``~name`` to the spec. you can turn it off by either adding ``-name`` or ``~name`` to the spec.