DOCS-1375: clarifying link
minor: fixing reference
SERVER-7589 Clarify conflict with Ubuntu packages

Signed-off-by: Sam Kleinman <samk@10gen.com>
SERVER-7589 Add mongodb-server package as well

Signed-off-by: Sam Kleinman <samk@10gen.com>
SERVER-7589 Clarify conflicting packages for Debian installation instructions

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1279 add shell method version()

Signed-off-by: Sam Kleinman <samk@10gen.com>