The "Search" feature of our Documentation site isn't very good.
For example, if you search for "collMod", you get this:
https://docs.mongodb.org/manual/search/?query=collMod
A page of links to documentation, none of which is the actual "collmod" documentation page.

A simple google search for "mongodb collmod" and the first search hit is the actual collmod documentation, for the latest version even!
http://docs.mongodb.org/manual/reference/command/collMod

Since Google indexes our documentation for free, why not simply defer to it?