Fix ping / pong default message

[abcdmitry]

What do these changes do?

Fix typo in default message for ping and pong methods

Are there changes in behavior for the user?

Ping and pong frames sent by server will not set default message as 'b' anymore

Related issue number

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-io]

Codecov Report

Merging #3308 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3308      +/-   ##
==========================================
- Coverage   98.07%   98.03%   -0.04%     
==========================================
  Files          43       43              
  Lines        8001     8001              
  Branches     1354     1354              
==========================================
- Hits         7847     7844       -3     
- Misses         63       65       +2     
- Partials       91       92       +1

Impacted Files	Coverage Δ
aiohttp/tcp_helpers.py	90% <0%> (-6.67%)	⬇️
aiohttp/client_reqrep.py	97.48% <0%> (-0.17%)	⬇️

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[asvetlov]

Thanks. Funny typo

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new