Merge pull request yidao620c#221 from AutuanLiu/patch-2

spelling mistake(minimum)

Author: yidao620c

source/c07/p02_functions_that_only_accept_keyword_arguments.rst

@@ -25,7 +25,7 @@
 
 .. code-block:: python
 
-    def mininum(*values, clip=None):
+    def minimum(*values, clip=None):
         m = min(values)
         if clip is not None:
             m = clip if clip > m else m