Add caret/hat to spack spec help documentation (#23758)
Add caret/hat to spack spec help documentation (#23758)

Co-authored-by: Jamie Finney <9ea324599d2d25acb4f4ba160bcbdfd092541af5@ornl.gov>
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack