[Python-checkins] fix typo in ThreadedChildWatcher docs (GH-23277)

[miss-islington]

https://github.com/python/cpython/commit/2837241f22be33a5597707b2aa723cb2cf6f3967
commit: 2837241f22be33a5597707b2aa723cb2cf6f3967
branch: 3.9
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2020-11-14T04:24:21-08:00
summary:

fix typo in ThreadedChildWatcher docs (GH-23277)

(cherry picked from commit 8836574a0f34ae81643c8af79bbb9062e332a4e3)

Co-authored-by: Thomas Grainger <tagrain at gmail.com>

files:
M Doc/library/asyncio-policy.rst

diff --git a/Doc/library/asyncio-policy.rst b/Doc/library/asyncio-policy.rst
index 88e69ceff9adc..5e69525e90dd2 100644
--- a/Doc/library/asyncio-policy.rst
+++ b/Doc/library/asyncio-policy.rst
@@ -209,7 +209,7 @@ implementation used by the asyncio event loop:
    It works reliably even when the asyncio event loop is run in a non-main OS thread.
 
    There is no noticeable overhead when handling a big number of children (*O(1)* each
-   time a child terminates), but stating a thread per process requires extra memory.
+   time a child terminates), but starting a thread per process requires extra memory.
 
    This watcher is used by default.