documentation: Various minor corrections and updates.
(cherry picked from commit de106aae60c43c6083c35666862b5f1fc67fe066)
documentation: Additional minor corrections and updates (as suggested by laune).
(cherry picked from commit 76bf1eab142945445263df08e07a5dfa675b4b45)
[DROOLS-381] allow to explicitly remove a KieModule from the KieRepository
(cherry picked from commit 342a3b24e0bb66af48f6811d7f4066f00f907d36)