[docs] [issue10461] Use with statement throughout the docs

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

> I’m not 100% sure I should change 'r' to 'rb' in logging:
> It’s unrelated to with, and the rest of the file 
> has not been checked for similar errors. 

Good catch.  This should only be a with-statement transformation.  I caught other accidental semantic changes, so be continue to exercise care.

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