message: Add instructions to enable fail points for test suite
  Several tests require use of the configureFailPoint command to trigger
  server-side errors. The command must be enabled via configuration file
  or command line option when starting mongod.
  The configureFailPoint command is not yet documented; see
diff: @@ -61,14 +61,14 @@ the [mongodb server](https://www.mongodb.com/download-center).
  Then deploy a mongod on the default port with the command:
  ```
  -mongod
  +mongod --setParameter enableTestCommands=1
  ```
  if it is installed, otherwise navigate to the directory holding the mongod
  executable, and run:
  ```
  -./mongod
  +./mongod --setParameter enableTestCommands=1
  ```
  following either command with any flags you wish to use, excluding
  