HPCC-10611 DOCS:Mark RFS functions in Std library as deprecated

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge pull request #5463 from JamesDeFabia/10611DeprecateRFS

HPCC-10611 DOCS:Mark RFS functions in Std library as deprecated

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>