Doc: Add missing spaces after period for `posix_spawn` (GH-22730)

(cherry picked from commit 5b57fa69408c4856bf0ae02f2eaa3db1ef980ea6)

Co-authored-by: Tomer Cohen <tomer@users.noreply.github.com>
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 64bc735..6e287ab 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -3695,8 +3695,8 @@
    The positional-only arguments *path*, *args*, and *env* are similar to
    :func:`execve`.
 
-   The *path* parameter is the path to the executable file.The *path* should
-   contain a directory.Use :func:`posix_spawnp` to pass an executable file
+   The *path* parameter is the path to the executable file.  The *path* should
+   contain a directory.  Use :func:`posix_spawnp` to pass an executable file
    without directory.
 
    The *file_actions* argument may be a sequence of tuples describing actions