Fix the documentation

README.md

@@ -5,15 +5,15 @@ This documentation is rudimentary.
 ## Apply "trace" fixers on the fly
 
 * When importing modules:
-  
+
   ```python
   from my2to3.trace import patch_imports
-  
+
   def is_whitelisted(fullname, path):
     # This function is used to whitelist specific modules. This corresponds to
     # https://www.python.org/dev/peps/pep-0302/.
     return True
-  
+
   patch_imports(is_whitelisted)
   ```
 
@@ -21,12 +21,12 @@ This documentation is rudimentary.
   
   ```python
   from my2to3.trace import tracing_functions, apply_fixers
-  
-  # `tracing_function` contains all the functions registered with
-  # `@register_tracing_function`. Add its content to the builtins (or
-  # equivalent) of the component to monkey-patch, e.g.:
+
+  # `tracing_functions` contains all the functions which trace data at runtime.
+  # Add its content to the builtins (or equivalent) of the component to
+  # monkey-patch, e.g.:
   component_builtins.update({f.__name__: f for f in tracing_functions})
-  
+
   # `name` must be a unique name which represents the code to modify, to easily
   # recognize it. In general, we use a filepath (or an equivalent). This is used
   # by the fixers.