Fix typos detected by Terry Reedy.

pep-0252.txt

@@ -540,7 +540,7 @@ C API
     - In the more complicated case, there's a conflict between names
       stored in the instance dict and names stored in the type dict.
       If both dicts have an entry with the same key, which one should
-      we return?  Looking as classic Python for guidance, I find
+      we return?  Looking at classic Python for guidance, I find
       conflicting rules: for class instances, the instance dict
       overrides the class dict, *except* for the special attributes
       (like __dict__ and __class__), which have priority over the
@@ -555,14 +555,14 @@ C API
 
       2. Look in the instance dict.  If you find anything, that's it.
          (This takes care of the requirement that normally the
-         instance dict overrides the class dict.
+         instance dict overrides the class dict.)
 
       3. Look in the type dict again (in reality this uses the saved
          result from step 1, of course).  If you find a descriptor,
          use its get() method; if you find something else, that's it;
          if it's not there, raise AttributeError.
 
-      This requires a classification of descriptors in data and
+      This requires a classification of descriptors as data and
       nondata descriptors.  The current implementation quite sensibly
       classifies member and getset descriptors as data (even if they
       are read-only!)  and member descriptors as nondata.