Use Activate modules as test scenario section name

issue9395
review291901002

tests/scenario_product_identifier.rst

@@ -8,7 +8,7 @@ Imports::
     >>> from proteus import Model, Wizard
     >>> from trytond.tests.tools import activate_modules
 
-Install product::
+Activate modules::
 
     >>> config = activate_modules('product')
 

tests/scenario_product_variant.rst

@@ -8,7 +8,7 @@ Imports::
     >>> from proteus import Model
     >>> from trytond.tests.tools import activate_modules
 
-Install product::
+Activate modules::
 
     >>> config = activate_modules('product')