Reword instructions for all Preference window uses

Raised by Martin Malina as part of JBQA-8676:

I have just one minor comment on the Central chapter:

JBoss Central and the JBoss Perspective
2.3.4. Use Project Examples when Working Offline

"To create the cache, click Window→Preferences. Expand JBoss Tools→Project Examples and select Offline Support."

It took me a minute to find the Offline support because this wording let me to expect that it's something in the Project Examples panel. Instead, it's a separate page in the preferences window. So I would suggest "Expand JBoss Tools→Project Examples→Offline Support."

Suggestion is to apply this change at every mention of Preference pane expansion for clarity and consistency.