Remove trailing whitespace.
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 1c69e25..ef5beaa 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1226,7 +1226,7 @@
These functions all execute a new program, replacing the current process; they
do not return. On Unix, the new executable is loaded into the current process,
and will have the same process id as the caller. Errors will be reported as
- :exc:`OSError` exceptions.
+ :exc:`OSError` exceptions.
The current process is replaced immediately. Open file objects and
descriptors are not flushed, so if there may be data buffered
@@ -1258,7 +1258,7 @@
used to define the environment variables for the new process (these are used
instead of the current process' environment); the functions :func:`execl`,
:func:`execlp`, :func:`execv`, and :func:`execvp` all cause the new process to
- inherit the environment of the current process.
+ inherit the environment of the current process.
Availability: Unix, Windows.
@@ -1456,7 +1456,7 @@
(Note that the :mod:`subprocess` module provides more powerful facilities for
spawning new processes and retrieving their results; using that module is
- preferable to using these functions. Check specially the *Replacing Older
+ preferable to using these functions. Check specially the *Replacing Older
Functions with the subprocess Module* section in that documentation page.)
If *mode* is :const:`P_NOWAIT`, this function returns the process id of the new