Tweak docs concerning method execution pointcut signature

Issue: SPR-13512

src/asciidoc/core-aop.adoc

@@ -589,7 +589,9 @@ what the return type of the method must be in order for a join point to be match
 frequently you will use `{asterisk}` as the returning type pattern, which matches any return
 type. A fully-qualified type name will match only when the method returns the given
 type. The name pattern matches the method name. You can use the `{asterisk}` wildcard as all or
-part of a name pattern. The parameters pattern is slightly more complex: `()` matches a
+part of a name pattern. If specifying a declaring type pattern
+then include a trailing `.` to join it to the name pattern component.
+The parameters pattern is slightly more complex: `()` matches a
 method that takes no parameters, whereas `(..)` matches any number of parameters (zero
 or more). The pattern `({asterisk})` matches a method taking one parameter of any type,
 `(*,String)` matches a method taking two parameters, the first can be of any type, the