[easy doc] Remove redundant info in README.valgrind

[shihai1991]

BPO	44766
Nosy	@fbidu, @shihai1991
PRs	gh-88929: remove outdated reference to Py_USING_MEMORY_DEBUGGER #27509

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-07-28.18:07:12.899>
labels = ['3.11', 'type-feature', 'docs']
title = '[easy doc] Remove redundant info in README.valgrind'
updated_at = <Date 2021-07-31.15:02:13.673>
user = 'https://github.com/shihai1991'

bugs.python.org fields:

activity = <Date 2021-07-31.15:02:13.673>
actor = 'fbidu'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-07-28.18:07:12.899>
creator = 'shihai1991'
dependencies = []
files = []
hgrepos = []
issue_num = 44766
keywords = ['patch']
message_count = 1.0
messages = ['398411']
nosy_count = 3.0
nosy_names = ['docs@python', 'fbidu', 'shihai1991']
pr_nums = ['27509']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue44766'
versions = ['Python 3.11']

[shihai1991]

Objects/obmalloc.c hasn't use the Py_USING_MEMORY_DEBUGGER macro now. So this line can be deleted.

cpython/Misc/README.valgrind

Line 17 in 31bec6f

* Uncomment Py_USING_MEMORY_DEBUGGER in Objects/obmalloc.c,

.

[arhadthedev]

This issue is a de-facto continuation of gh-82703.