HPCC-9205 SprayVariable file fix

Fix HPCC-9205 SprayVariable file fix
Fix XML Error in ECLStandLibraryReference/
SprayVariable.xml file causing file to be
invalid and downstream processes fail.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #4300 from g-pan/H9205-SVarFileFix

HPCC-9205 SprayVariable file fix

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>