[issue20208] Clarify some things in porting HOWTO

[Rodrigo Bernardo Pimentel]

Rodrigo Bernardo Pimentel added the comment:

BTW, there remains another concern I mentioned on G+:

"""
A note on formatting: I found some of 4th- and 5th-level headings too subtle. For instance, http://docs.python.org/dev/howto/pyporting.html#from-future-import-absolute-import got me thinking for a second if it was part of the previous paragraph or a new heading. Maybe underlining, or a bullet-like marker, or some indentation could help there.
"""

But I don't know enough of the formatting standards, so I haven't addressed this in the patch.

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