Polishing.

Replace self xrefs to <<…>> self reference syntax.

See #2912

src/main/antora/modules/ROOT/pages/query-by-example.adoc

@@ -57,9 +57,9 @@ You can use it to create an `Example`.
 By default, fields having `null` values are ignored, and strings are matched by using the store specific defaults.
 
 NOTE: Inclusion of properties into a Query by Example criteria is based on nullability.
-Properties using primitive types (`int`, `double`, …) are always included unless  the xref:query-by-example.adoc#query-by-example.matchers[`ExampleMatcher` ignores the property path].
+Properties using primitive types (`int`, `double`, …) are always included unless  the <<query-by-example.matchers,`ExampleMatcher` ignores the property path>>.
 
-Examples can be built by either using the `of` factory method or by using xref:query-by-example.adoc#query-by-example.matchers[`ExampleMatcher`]. `Example` is immutable.
+Examples can be built by either using the `of` factory method or by using <<query-by-example.matchers,`ExampleMatcher`>>. `Example` is immutable.
 The following listing shows a simple Example:
 
 .Simple Example