[docs] typo in tutorial 2.7/3.1.2. Strings

[Mr&Mrs D]

The string
*The interpreter prints the result of string operations in the same way as
they are typed for input: inside quotes, and with quotes and other funny
characters escaped by backslashes, to show the precise value. The string is
enclosed in double quotes if the string contains a single quote and no
double quotes, else it’s enclosed in single quotes.*
is repeated verbatim twice

Thanks
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