Rules and syntax of annotation in a single section.

After removing equivalent form examples from syntax tables and clarified what
access annotation is all about, it becomes easier to express everything that
annotated template parameter packs are within a single, dense section. This
makes examples coming after less verbose to explain since the table can be
used as continuous reference.

Also, started deprecating the term "anchored" and "anchoring" over "access"
in expansion and single-expression "interval" in declaration. It needs a
little more care, but it is getting there. Issues #9, #10 are related.