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

This fixes an apparent copy-and-paste error.

Patch by Manuel Jacob.
diff --git a/Misc/ACKS b/Misc/ACKS
index 39195ef..8fbf9d0 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -505,6 +505,7 @@
 Adam Jackson
 Ben Jackson
 Paul Jackson
+Manuel Jacob
 David Jacobs
 Kevin Jacobs
 Kjetil Jacobsen