devel/py-trio: Update COMMENTS

[wen heping]

Hi, ports@:

    Seems the COMMENTS of devel/py-trio is duplicate of devel/py-untangle.
It should be updated as the patch below:

--- Makefile    27 Nov 2023 20:37:54 -0000      1.1.1.1
+++ Makefile    10 Jan 2024 07:19:05 -0000
@@ -1,4 +1,4 @@
-COMMENT =      converts XML to Python objects
+COMMENT =      library for async concurrency and I/O

Cheers !
wen