Add a comment to the manual's section about MatcherRules regarding unqualified / qualified identifier matching

[deinspanjer]

Add note about the fact the expression is tested against the unqualified name first then the qualified name.
Might help prevent confusion similar to this thread:
https://groups.google.com/forum/#!topic/jooq-user/XwRzNf5Gtjs

[lukaseder]

Thank you very much for your suggestion. I will implement the improvement slightly differently:

• Your detailed wording will be moved in a separate chapter explaining regular expression usage in the code generator configuration (that chapter will then also explain the new <matchMode/> element: Add <matchMode/> code generation flag to govern how regular expressions match identifiers #5768)
• Each expression reference will choose an abbreviated wording referencing the general idea of matching "unqualified, then qualified" identifiers

[deinspanjer]

That is great, I'm glad that this text could be of some use. I just did not want to make a bunch of suggestions on things to do and not offer any assistance.

[lukaseder]

Hey, sure. Your assistance is greatly appreciated. Looking forward to more of it! :)