Small nits in os doc.
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 2fce4e5..4251113 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -645,7 +645,7 @@
.. function:: closerange(fd_low, fd_high)
Close all file descriptors from *fd_low* (inclusive) to *fd_high* (exclusive),
- ignoring errors. Equivalent to::
+ ignoring errors. Equivalent to (but much faster than)::
for fd in range(fd_low, fd_high):
try:
@@ -729,6 +729,7 @@
Availability: Unix, Windows.
+
.. function:: fstatvfs(fd)
Return information about the filesystem containing the file associated with file