#17275: Fix class name in init errors in C bufferedio classes.

This fixes an apparent copy-and-paste error.

Original patch by Manuel Jacob.
diff --git a/Misc/ACKS b/Misc/ACKS
index 1c453f0..aabc361 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -466,6 +466,7 @@
 Atsuo Ishimoto
 Paul Jackson
 Ben Jackson
+Manuel Jacob
 David Jacobs
 Kevin Jacobs
 Kjetil Jacobsen