Fix typos in docs and docstrings (GH-13745)

diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 5496f6e..62f2fd2 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -2163,7 +2163,7 @@
     >>> (b / 'missing.txt').exists()
     False
 
-    Coersion to string:
+    Coercion to string:
 
     >>> str(c)
     'abcde.zip/b/c.txt'