manual: wrong links in 3.5

[Cayetano Santos]

Hi Guile,

  I noticed a couple of erroneous links in section 3.5 of the guile
  manual. The right links are:

    https://docs.scheme.org/tyscheme/index.html
    
https://mitpress.mit.edu/9780262510875/structure-and-interpretation-of-computer-programs/

Regards,

--
Cayetano Santos
.
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