[doc] Fix a few margins due to bad markup (GH-23619)
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index ab1a615..35cf7c0 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1323,12 +1323,12 @@
.. data:: RWF_APPEND
- Provide a per-write equivalent of the :data:`O_APPEND` :func:`os.open`
- flag. This flag is meaningful only for :func:`os.pwritev`, and its
- effect applies only to the data range written by the system call. The
- *offset* argument does not affect the write operation; the data is always
- appended to the end of the file. However, if the *offset* argument is
- ``-1``, the current file *offset* is updated.
+ Provide a per-write equivalent of the :data:`O_APPEND` :func:`os.open`
+ flag. This flag is meaningful only for :func:`os.pwritev`, and its
+ effect applies only to the data range written by the system call. The
+ *offset* argument does not affect the write operation; the data is always
+ appended to the end of the file. However, if the *offset* argument is
+ ``-1``, the current file *offset* is updated.
.. availability:: Linux 4.16 and newer.