Fixes #3321 : add a warning about the manual escaping of variables in directive in Rudder < 2.6
Merge pull request #6 from ncharles/ust_2947/doc/3321_add_warning_about_escaping

Fixes #3321 : add a warning about the manual escaping of variables in directive in Rudder < 2.6
Merge branch 'branches/rudder/2.3' into branches/rudder/2.4

* branches/rudder/2.3:
  Fixes #3321 : add a warning about the manual escaping of variables in directive in Rudder < 2.6

Conflicts:
	22_configuration_management/33_policy_instances.txt
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5

* branches/rudder/2.4:
  Fixes #3321 : add a warning about the manual escaping of variables in directive in Rudder < 2.6
Merge branch 'branches/rudder/2.5'

* branches/rudder/2.5:
  Fixes #3321 : add a warning about the manual escaping of variables in directive in Rudder < 2.6