Possibly unclear documentation

[rm]

Hello list,

 browsing through the current documentation i just
 realized that in several places example code uses
 'read-line' which was moved from core to '(ice-9 rdelim)
 a while ago (files using it: gh.texi, intro.texi, 
 srfi-modules.texi). The function is documented in file
 'scheme-io.texi' but i think it might be a good idea
 to document the need to use module (ice-9 rdelim) anyway.

   Ralf