DOCS-2788: tweak to wording of glossary entry
DOCS-2504 runtime options: mongos

Signed-off-by: Sam Kleinman <samk@10gen.com>
pasted content from a manpage directly into configuration-contents

Signed-off-by: Sam Kleinman <samk@10gen.com>
renaming include file
DOCs-2540: ordering and checks for the mongos manpage