some examples in docs don't compile

[Mark Polesky]

Some examples in the online documentation incorrectly use a
"right single quotation mark" (U+2019 - ’) where an "apostrophe"
(U+0027 - ') belongs, causing these examples to fail when run.

I've also found instances of "right double quotation mark"
(U+201D - ”) in place of 2 apostrophes, and one instance of
"left single quotation mark" (U+2018 - ‘) in place of an
"grave accent" (U+0060 - `). Ordinarily, I guess I wouldn't
bother, but if a user copies and pastes and example to try it
out, and gets an error message... It just doesn't look good.

I've made a list of instances that I've found (limited to NR 6)
but there may be others throughout the docs. Incidentally, I
wonder if some word-processor is auto-formatting some of these
examples. Something to look out for.

Mark

wrong_characters.txt
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