aux -> int [ci skip]

l3kernel/l3doc.dtx

@@ -416,7 +416,7 @@ and all files in that bundle must be distributed together.
 % for, say, having a test function and having a documentation chunk
 % earlier in a \env{function} environment.  \pkg{l3doc} will pick up these
 % cases form the presence of |__| in the name, or you may force marking
-% as internal by using |\begin{macro}[aux]| to mark it as such. The margin
+% as internal by using |\begin{macro}[int]| to mark it as such. The margin
 % call-out is then printed in grey for such cases.
 %
 % For documenting \pkg{expl3}-type conditionals, you may also pass this