Fix typos

Author: kianmeng

testing/test_details.py

@@ -75,7 +75,7 @@ def test_plugin_getattr_raises_errors():
 
     class DontTouchMe:
         def __getattr__(self, x):
-            raise Exception("cant touch me")
+            raise Exception("can't touch me")
 
     class Module:
         pass

tox.ini

@@ -45,7 +45,7 @@ filterwarnings =
 max-line-length=99
 
 [testenv:release]
-decription = do a release, required posarg of the version number
+description = do a release, required posarg of the version number
 basepython = python3
 skipsdist = True
 usedevelop = True