HPCC-11847 Embedded R component installation info is out of date

Update R intallations steps

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-11847 Embedded R component installation info is out of date

Update after review.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #6187 from AttilaVamos/HPCC-11847-fix

HPCC-11847 Embedded R component installation info is out of date

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>