[Guided Tour] Step for expression selection is not clear enough

This issue is related to KOGITO-764 feature.

One step of the tour guide user to select expression of the new 'Can drive?' node.

However there is just prompt to invoke 'Select expression' menu. There is no reference which option of the menu to select. The issue is the step is assumed as done just if user select some option of the menu and at the same time user need to select 'Literal expression' option. All other choices result into dismiss dialog. In the example below user selected 'List' expression.

Furthermore the wording for clicking back to should be improved:

• letters upper lower case should match
• should be quoted or in bold