HPCC-12592 DOCS:Update Samples in installing and Running

FIX HPCC-12592 DOCS:Update Sample cmds installing and Running
Update documentation sample commands removd the -u hpcc
as that is no longer necessary.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6649 from g-pan/H12592-SampleInR

HPCC-12592 DOCS:Update Samples in installing and Running

Reviewed-By: Jim DeFabia <james.defabia@lexisnexis.com>
Reviewed-By: Xiaoming Wang <xiaoming.wang@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>