[Bug-gsl] typo error

[Србислав Нешић]

In PDF document

https://www.gnu.org/software/gsl/doc/latex/gsl-ref.pdf

page 534

e = *1* + 1/2! + 1/3! + 1/4! + ...

should be

e = *2* + 1/2! + 1/3! + 1/4! + ...

or

e = *1 + 1* + 1/2! + 1/3! + 1/4! + ...

Regards, Srba