[issue44766] [easy doc] Remove redundant info in README.valgrind

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

Objects/obmalloc.c hasn't use the Py_USING_MEMORY_DEBUGGER macro now. So this line can be deleted.
https://github.com/python/cpython/blob/31bec6f1b178dadec3cb43353274b4e958a8f015/Misc/README.valgrind#L17.

----------
assignee: docs at python
components: Documentation
messages: 398411
nosy: docs at python, shihai1991
priority: normal
severity: normal
status: open
title: [easy doc] Remove redundant info in README.valgrind
type: enhancement
versions: Python 3.11

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44766>
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