Minor fixes

Author: davepeck

peps/pep-0750.rst

@@ -176,7 +176,7 @@ Template strings evaluate to an instance of a new type, ``<<TBD>>.Template``:
             """
             ...        
 
-The ``strings`` and ``interpolation`` attributes provide access to the string 
+The ``strings`` and ``interpolations`` attributes provide access to the string 
 parts and any interpolations in the literal:
 
 .. code-block:: python
@@ -186,7 +186,7 @@ parts and any interpolations in the literal:
     assert template.strings[0] == "Hello "
     assert template.interpolations[0].value == "World"
 
-The ``Template`` type is shallow immutable. Its attributes cannot be reassigned.
+The ``Template`` type is immutable.
 
 
 The ``Interpolation`` Type
@@ -214,7 +214,7 @@ Like ``Template``, it is a new class found in the ``<<TBD>>`` module:
         ):
             ...
 
-Like ``Template``, ``Interpolation`` is shallow immutable. Its attributes 
+The ``Interpolation`` type is shallow immutable. Its attributes 
 cannot be reassigned.
 
 The ``value`` attribute is the evaluated result of the interpolation: