In the preface section of the book, there are several sporadic inclusions of the character [O] and its stylistic variants [Õ] and [Ò] in the two paragraphs under the section 'Using Code Examples'.

Specifically with reference to the file ch00.rst, here are the instances of the typo error:
line 527 "unless youÕre reproducing"
line 529 "from OÕReilly books
line 532 "your productÕs documentation"
line 535 "For example: ÒNatural Language Processing"

The [Õ] character seems to have been a result of the transfer of the apostrophe character [']. A recommended fix would be to change

It is unclear what the [Ò] character was originally meant to be. Thus, no recommended fix can be suggested.