[docs] A small bug on the "6.2. re" page

[Maksym Nikulyak]

Hi,

On the 3.6.1 documentation's "6.2. re — Regular expression operations"
page, it is said "... consult the Friedl book referenced above, ...";
however, the actual reference of this book is given below.

Best regards, and great Thank you,
mx
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