[docs] single quotes encoding problem with pdf versions

[mybiz at toeai.com]

Hi,

I noticed while reading through the PDF version of the Tutorial
(tutorial.pdf) that there is something which could be confusing because it
doesn't come through from the source encoded properly.  The problem
doesn't affect the text and HTML versions, but it does affect both the A4
and Letter formatted PDF versions.  There are likely other places where
this error occurs, but if you fix whatever is making your source produce
the wrong characters, it should fix them too.

On page 12 when talking about strings, you find the sentence:
Or, strings can be surrounded in a pair of matching triple-quotes: """ or ”’.
What it should read is of course:
Or, strings can be surrounded in a pair of matching triple-quotes: """ or
'''.

In the PDF versions, the three single quotes (aka apostrophes U+0027 (39))
are swapped out with a double right quote (U+201D) followed by a single
right quote (U+2019).

I hope this explanation is quite clear and that you'll have an easy time
fixing the problem.  Feel free to contact me with any follow-up.

Thanks.