changed first argument to kr

to match the default for the restructured text 'schelp_descriptor.schelp' file in the 'flucoma-docs' repo

this needs to happen or else SCDocs will throw a warning everytime the user opens this helpfile

release-packaging/Classes/FluidStats.sc

@@ -2,8 +2,8 @@ FluidStats : MultiOutUGen {
 
     var <channels;
 
-	*kr { arg inputsArray, size;
-        ^this.multiNew('control',*(inputsArray.asArray++size));
+	*kr { arg in, size;
+        ^this.multiNew('control',*(in.asArray++size));
 	}
 
 	init {arg ...theInputs;