Fix documentation on configuration page about cukes.profile

[adiEast]

The wiki page https://github.com/ctco/cukes/wiki/Configuration:
I

s it possible to override default name for properties file by creating system environment variable called "cukes.profile", containing filename.

cukes.profile = "cucumber-profile.properties"

But this would resolve to "cucumber-cucumber-profile.properties.properties"

Wanted:
... called "cukes.profile", containing profile name.
cukes.profile = test
Resolves to cucumber-test.properties