`log4j-docgen` cannot convert method references with multiple arguments in Javadoc to AsciiDoc

The following Javadoc copied from `org.apache.logging.log4j.core.filter.AbstractFilter`
```
Garbage-free note: the methods with unrolled varargs by default delegate to the
{@link #filter(Logger, Level, Marker, String, Object...) filter method with vararg parameters}.
Subclasses that want to be garbage-free should override these methods to implement the appropriate filtering
without creating a vararg array.
```
gets converted to
```
Garbage-free note: the methods with unrolled varargs by default delegate to the apiref:org.apache.logging.log4j.core.filter.AbstractFilter#filter(Logger, Level, Marker, String, Object...)[filter method with vararg parameters].
```
This AsciiDoc is invalid due to the whitespace in between method arguments. As a result, AsciiDoctor doesn't even recognize the `apiref:...` snippet as an inline macro, and consequently, don't call `ApirefMacro`.