DOCS-1492 rs.addArb, rs.freeze, rs.initiate, rs.stepDown, sh.disableBalancing, sh.enableBalancing, sh.setBalancerState

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: edits for DOCS-1492
DOCS-1492 cat, cd, db.cloneDatabase, db.collection.aggregate, db.collection.getIndexStats, db.collection.indexStats, db.collection.stats

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1492 sh._lastMigration, db.createCollection

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1492 db.collection.validate, db.commandHelp, db.getCollection, db.killOp, db.stats, fuzzFile, load, md5sumFile, mkdir, Mongo, Mongo.getDB, removeFile

Signed-off-by: Sam Kleinman <samk@10gen.com>
edits for DOCS-1492
DOCS-1492 command/group