DOCS-2446 positional update operator and nested array
Update db.collection.findOne-param.yaml
Update db.collection.findOne.txt
Update gt.txt
Update gt.txt
spacing
Update glossary.txt

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

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

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2685: downgrade clarification
DOCS-2195 uniqueDocs deprecation changes
trivial word change: displays to removes