[issue2120] broken links in advocacy HOWTO

[Ori Avtalion]

Ori Avtalion added the comment:

Removing the spaces is wrong. They should be replaced with '~'.

I also found two other punctuation problems:
* A period that should be a colon.
* A comma that should be a dash/semicolon/something else. I'm not really
sure what's the best replacement.

See the attached advocacy.patch

Added file: http://bugs.python.org/file9435/advocacy.patch

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