bpo-25415: Remove confusing sentence from IOBase docstrings (PR-31631)

(cherry picked from commit cedd2473a9bebe07f3ced4f341cf58a2fef07b03)

Co-authored-by: slateny <46876382+slateny@users.noreply.github.com>
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 5b687b7..4c81bef 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -34,8 +34,7 @@ typedef struct {
 } iobase;
 
 PyDoc_STRVAR(iobase_doc,
-    "The abstract base class for all I/O classes, acting on streams of\n"
-    "bytes. There is no public constructor.\n"
+    "The abstract base class for all I/O classes.\n"
     "\n"
     "This class provides dummy implementations for many methods that\n"
     "derived classes can override selectively; the default implementations\n"