Merge pull request #1035 from baijunyao/master

Update class_constants.rst

docs/cookbook/class_constants.rst

@@ -8,7 +8,7 @@ When creating a test double for a class, Mockery does not create stubs out of
 any class constants defined in the class we are mocking. Sometimes though, the
 non-existence of these class constants, setup of the test, and the application
 code itself, it can lead to undesired behavior, and even a PHP error:
-``PHP Fatal error:  Uncaught Error: Undefined class constant 'FOO' in ...```
+``PHP Fatal error:  Uncaught Error: Undefined class constant 'FOO' in ...``
 
 While supporting class constants in Mockery would be possible, it does require
 an awful lot of work, for a small number of use cases.