Fixed a typo in the HTMLParser.feed docstrings

[dasdachs]

The docstring started with an 'r', like a rawstring.

[mention-bot]

@dasdachs, thanks for your PR! By analyzing the history of the files in this pull request, we identified @ezio-melotti, @freddrake and @bitdancer to be potential reviewers.

[the-knights-who-say-ni]

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[serhiy-storchaka]

Thank you for your patch @dasdachs. Do you mind to backport your change to other active branches (3.6, 3.5, and maybe 2.7)?

[dasdachs]

Thank you @serhiy-storchaka! I'll backport the changes as soon as I can.

[vadmium]

This looks wrong to me. It looks like it will have a real newline rather than the literal \n escape sequence. See commit 39f180b.

[serhiy-storchaka]

Oh, my bad! I read the patch as adding the "r" prefix!

[dasdachs]

Of course it does. Sorry for the unnecesary work @serhiy-storchaka and thank you @vadmium!