Some typo fixes.

Author: ZeroIntensity

peps/pep-0797.rst

@@ -175,10 +175,6 @@ In doing so, an object will release its memory back to CPython's object allocato
 allocator is per-interpreter, so it is unsafe to try to release an object's
 memory in an interpreter different from the one that created it.
 
-Rationale
-=========
-
-
 Specification
 =============
 
@@ -419,8 +415,6 @@ The psuedo-code looks like this:
 Identifying Immortal Referents
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-In some cases, a
-
 To find the mortal objects that might want to reference an immortal, we have
 to make a reasonable assumption about how garbage collection works: in order
 for an object to :c:func:`Py_DECREF` another object in its destructor, it