Apply suggestions from code review

Co-authored-by: Jelle Zijlstra <[email protected]>

peps/pep-0733.rst

@@ -157,7 +157,7 @@ Alternative APIs
 There are several projects that implement alternatives to the
 C API, which offer extension users advantanges over programming
 directly with the C API. These APIs are implemented with the
-C API, and in some cases by using cpython internals.
+C API, and in some cases by using CPython internals.
 Some examples are
 `Cython <https://cython.org>`__,
 `HPy <https://hpyproject.org>`__ and
@@ -237,17 +237,7 @@ C API problems
 
 The remainder of this document summarizes and categorizes the problems that were reported on
 the `capi-workgroup <https://github.com/capi-workgroup/problems/issues/>`__ repository.
-The issues are grouped into nine categories:
-
-- API Evolution and Maintenance
-- API Specification and Abstraction
-- Object Reference Management
-- Type Definition and Object Creation
-- Error Handling
-- API Tiers and Stability Guarantees
-- Use of the C Language
-- Implementation Flaws
-- Missing Functionality
+The issues are grouped into several categories.
 
 
 API Evolution and Maintenance
@@ -510,7 +500,7 @@ such as ``int32_t`` and ``int64_t`` would have been better choices
 [`Issue 27 <https://github.com/capi-workgroup/problems/issues/27>`__].
 
 We are using C language features which are hard for other languages
-to interact with
+to interact with, such as macros, variadic arguments, enums, and bitfields
 [`Issue 35 <https://github.com/capi-workgroup/problems/issues/35>`__].
 
 There are API functions that take a ``PyObject*`` arg which must be
@@ -522,7 +512,7 @@ more specific type
 
 There are functions in the API that take concrete types, such as
 ``PyDict_GetItemString`` which performs a dictionary lookup for a key
-specified as a c string rather than ``PyObject*``. At the same time,
+specified as a C string rather than ``PyObject*``. At the same time,
 for ``PyDict_ContainsString`` it is not considered appropriate to
 add a concrete type alternative. The principle around this should
 be documented in the guidelines