Rudder

For the three Variable techniques, the description use term that are very CFEngine specific, and will be very strange for new comes in Rudder who don't have a CFEngine previous experience.

For example, for 'Variable (string)', we have the following description:

Configures a generic CFEngine variable in a common bundle, to be used in another Technique. This Technique does nothing by itself, you must reuse the variable(s) you will create here in another Technique with the form: ${generic_variable_definition.variablename}

We really don't need all the bundle & co thing. Something along the following text will be clearer:

Define new variables that can be used in other Techniques or Directive parameters with the syntax: ${generic_variable_definition.variablename}. That expression will be expanded to the value defined for "variablename" below. 

I propose to do the change only in 4.1 to go with other naming evolution done in #10214