[java] Expected attribute name

I’m using dox 1.6.0 with haxe 4.3.0-rc.1+a49b191 on a multi-target project.
When I try to generate the documentation for the java target, I get the following error (here is the xml [java.xml.zip](https://github.com/HaxeFoundation/dox/files/8998821/java.xml.zip)):

```
Using Node.js version of dox...
Parsing bin/docs/java.xml
src/dox/Dox.hx:143: Error while parsing bin/docs/java.xml

/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:2944
throw haxe_Exception.thrown(err);
^
Error: haxe.xml.XmlParserException: Expected attribute name at line 71314 char 23
at new haxe_ValueException (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:6018:17)
at Function.haxe_Exception.thrown (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:4405:11)
at parseFile (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:2944:25)
at Function.dox_Dox.run (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:2961:3)
at Function.dox_Dox.main (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:2914:10)
at /Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:19317:9
at Object. (/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib/run.js:19318:3)
at Module._compile (internal/modules/cjs/loader.js:1085:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
at Module.load (internal/modules/cjs/loader.js:950:32) {
__previousException: undefined,
__nativeException: [Circular *1],
__skipStack: 2,
value: {
xml: ...,
message: 'Expected attribute name',
position: 2976744,
lineNumber: 71314,
positionAtLine: 23
}
}
Failed to invoke `haxelib run-dir dox "/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib" -i bin/docs/java.xml -o bin/pages` because Error: Command failed: haxelib run-dir dox "/Users/acarioni/haxe/haxe_libraries/dox/1.6.0/haxelib" -i bin/docs/java.xml -o bin/pages
```