Copyedits for typos

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-4398: clarifies authenticationDatabase description

- --authenticationDatabase is required for mongotop and mongostat
  when connecting to a mongod or mongos that uses auth

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-3400: further clarifies default for non-tools DOCS-3400: clarifies default for mongo

Signed-off-by: Sam Kleinman <samk@10gen.com>
wip: primer add python examples
DOCS-4346 2.8 eq operator
remove extra space
Two small grammar and misspelling changes
Merge pull request #2089 from gianpaj/patch-4

Two small grammar and misspelling changes
DOCS-4397: adding link for removed option
DOCS-4510: link target for auth compatibility change
Merge remote-tracking branch 'refs/remotes/origin/master' into copyedits