Misc. trivial typos

Found via `codespell -q 3`

NEWS.rst

@@ -13,7 +13,7 @@
 
 - Fix an error where the vendored requests was not correctly containing itself
   to only the internal vendored prefix.
-- Restore compatability with 2.6.
+- Restore compatibility with 2.6.
 
 
 9.0.2 (2018-03-16)

tests/lib/__init__.py

@@ -709,7 +709,7 @@ def create_basic_wheel_for_package(script, name, version, depends, extras):
         "{dist_info}/top_level.txt": """
             {name}
         """,
-        # Have an empty RECORD becuase we don't want to be checking hashes.
+        # Have an empty RECORD because we don't want to be checking hashes.
         "{dist_info}/RECORD": ""
     }
 

tests/unit/test_finder.py

@@ -402,7 +402,7 @@ def test_finder_only_installs_data_require(data):
     distribution are compatible with which version of Python by adding a
     data-python-require to the anchor links.
 
-    See pep 503 for more informations.
+    See pep 503 for more information.
     """
 
     # using a local index (that has pre & dev releases)

tests/yaml/README.md

@@ -1,5 +1,5 @@
 # Fixtures
 
-This directory contains fixtures for testing pip's resolver. The fixtures are written as yml files, with a convinient format that allows for specifying a custom index for temporary use.
+This directory contains fixtures for testing pip's resolver. The fixtures are written as yml files, with a convenient format that allows for specifying a custom index for temporary use.
 
 <!-- TODO: Add a good description of the format and how it can be used. -->