exec => true no longer needed? But appears in docs?

[powellnathanj]

We just updated to the latest version and it looks like exec => true is no longer a valid parameter, but it is still in the docs.

[edestecd]

@slaney Yea the docs are pretty poor and have never been updated, since we took on the module.

Any PR gladly accepted... I'll get to it eventually if no one else does.