bpo-36766: Typos in docs and code comments (GH-13116)

diff --git a/Lib/multiprocessing/resource_sharer.py b/Lib/multiprocessing/resource_sharer.py
index 730b2aa..8d5c990 100644
--- a/Lib/multiprocessing/resource_sharer.py
+++ b/Lib/multiprocessing/resource_sharer.py
@@ -59,7 +59,7 @@
 
 
 class _ResourceSharer(object):
-    '''Manager for resouces using background thread.'''
+    '''Manager for resources using background thread.'''
     def __init__(self):
         self._key = 0
         self._cache = {}