Fix(doc): ClientResponse.release should be a instance method, not a c…

[Hanaasagi]

What do these changes do?

From the doc, https://docs.aiohttp.org/en/stable/client_reference.html?highlight=release#aiohttp.ClientResponse.release

The ClientResponse.release is a coroutine, but in fact it is a instance method in the source code.

aiohttp/aiohttp/client_reqrep.py

Lines 906 to 918 in 10995e8

	def release(self) -> Any:
	if not self._released:
	self._notify_content()
	if self._closed:
	return noop()
	self._closed = True
	if self._connection is not None:
	self._connection.release()
	self._connection = None
	self._cleanup_writer()
	return noop()

Are there changes in behavior for the user?

Only change the doc.

Related issue number

#5836

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov]

Codecov Report

Merging #5835 (d51f8b2) into master (10995e8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5835   +/-   ##
=======================================
  Coverage   96.75%   96.75%           
=======================================
  Files          44       44           
  Lines        9849     9849           
  Branches     1591     1591           
=======================================
  Hits         9529     9529           
  Misses        182      182           
  Partials      138      138           

Flag	Coverage Δ
unit	96.64% <ø> (ø)

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