[issue38600] Change the mark up of NULL

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

Currently NULL is mostly marked up as *NULL* in the C API documentation (although it is marked up as ``NULL`` outside of the C API documentation). It is rendered with italic font as function parameters and contradicts with formatting other macros and constants with monospace font.

The proposed PR replaces all *NULL* with ``NULL``.

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assignee: docs at python
components: Documentation
messages: 355452
nosy: docs at python, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Change the mark up of NULL
type: enhancement
versions: Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38600>
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