Reformat changelog

CHANGES/682.bugfix

@@ -2,6 +2,9 @@ Restored back ``MultiDict``, ``CIMultiDict``, ``MultiDictProxy``, and
 ``CIMutiDictProxy`` generic type arguments; they are parametrized by value type, but the
 key type is fixed by container class.
 
-``MultiDict[int]`` means ``MutableMultiMapping[str, int]``. The key type of ``MultiDict`` is always ``str``, while all str-like keys are accepted by API and converted to ``str`` internally.
+``MultiDict[int]`` means ``MutableMultiMapping[str, int]``. The key type of
+``MultiDict`` is always ``str``, while all str-like keys are accepted by API and
+converted to ``str`` internally.
 
-The same is true for ``CIMultiDict[int]`` which means ``MutableMultiMapping[istr, int]``. str-like keys are accepted but converted to ``istr`` internally.
+The same is true for ``CIMultiDict[int]`` which means ``MutableMultiMapping[istr,
+int]``. str-like keys are accepted but converted to ``istr`` internally.