constrain -> constraint

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2618: improve navigational context
DOCS-2502 runtime options: shared options
DOCS-2502 runtime options: removing an extra layer of nesting
DOCS-2502 runtime options: move mangpage-options-ssl-tools to options-shared
DOCS-2507 runtime options: mongoexport, part I
DOCS-2502 runtime options: move manpage-options-auth.rst to options-shared
DOCS-2507 runtime options: mongoexport, part II
DOCS-2508 runtime options: mongoimport
DOCS-2505 runtime options: mongodump
runtime options: change {{role}} to {{program}}
DOCS-2506 runtime options: mongorestore
DOCS-2509 runtime options: mongosniff
DOCS-2510 runtime options: mongooplog