More doc fixes

docs/library/zlib.rst

@@ -5,6 +5,7 @@
 
 .. module:: zlib
    :synopsis: zlib decompression
+   :noindex:
 
 |see_cpython_module| :mod:`cpython:zlib`.
 
@@ -26,6 +27,7 @@ Functions
    CPython and is ignored.
 
 .. class:: DecompIO(stream, wbits=0, /)
+   :noindex:
 
    Create a ``stream`` wrapper which allows transparent decompression of
    compressed data in another *stream*. This allows to process compressed

shared-bindings/zlib/DecompIO.c

@@ -69,7 +69,7 @@
 //|         ...
 //|
 //|     def readline(self, nbytes: Optional[int] = None) -> Optional[bytes]:
-//|         """Read and return one line from the stream. The line terminator is always b'\n'.
+//|         """Read and return one line from the stream. The line terminator is always b'\\n'.
 //|         If ``nbytes`` is specified then read at most that many bytes.
 //|
 //|         :return: Data read