DOCS-2247 add dropRole and dropRoles methods

Signed-off-by: kay <kay.kim@10gen.com>
trivial edits to dropRole and dropAllRoles
DOCS-2332 add db.revokePrivilegesFromRole method

Signed-off-by: kay <kay.kim@10gen.com>
revokePrivilegesFromRole changes
DOCS-1892: Document 'non-mapped' field in mongostat

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2248 add db.createRole() method

Signed-off-by: kay <kay.kim@10gen.com>
tweaks to createRole and remove errant n from updateRole
add param table for db.createUser method
DOCS-2246 add updateRole method

Signed-off-by: kay <kay.kim@10gen.com>
tweaks to updateRole
edit to syntax example

Signed-off-by: kay <kay.kim@10gen.com>
update to edit to syntax example

Signed-off-by: kay <kay.kim@10gen.com>
tweaks to updateRole
tweak to syntax
fix updateUser example syntax
Fix typo

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-2346: fixing formating of sequence of operations
DOCS-2245 add grantPrivilegesToRole method

Signed-off-by: kay <kay.kim@10gen.com>
add scope of inherited roles and privileges for user def roles - commands
add scope of inherited roles and privileges for user def roles - methods