Merge pull request #113 from barbarossa22/master

Fix minor typos in the text

Author: adewes

docs/maintainability/from_module_import_all_used.rst

@@ -44,7 +44,7 @@ In these cases, use one of these idioms:
     # or
 
     import multiprocessing as mp
-    pool = mp.pool(8)
+    pool = mp.Pool(8)
 
 
 References

docs/readability/test_for_object_identity_should_be_is_not.rst

@@ -2,7 +2,7 @@ Test for object identity should be ``is``
 ========================================
 
 Testing the identity of two objects can be achieved in python with a special operator called ``is``.
-Most prominently it is used to check whether an variable points to ``None``.
+Most prominently it is used to check whether a variable points to ``None``.
 But the operator can examine any kind of identity.
 This often leads to confusion because equality of two different objects will return ``False``.