Revert "Update &prompt docs according to the changes introduced with rakudo/rakudo#1906."

This reverts commit 917a52a.

Reverted because the change is not released yet. My fault, sorry!

Author: jkramer

doc/Type/IO.pod6

@@ -251,13 +251,11 @@ note 1..*;  # STDERR OUTPUT: «1..Inf␤»
     multi prompt($msg)
 
 L<Prints|/routine/print> C<$msg> to C<$*OUT> handle, if C<$msg> was provided,
-then L<gets|/routine/get> a line of input from C<$*IN> handle and pass it through L<val|/routine/val>.
-By default, this is equivalent to printing C<$msg> to
+then L<gets|/routine/get> a line of input from C<$*IN> handle. By default,
+this is equivalent to printing C<$msg> to
 L<STDOUT|https://en.wikipedia.org/wiki/Standard_streams#Standard_output_.28stdout.29>, reading a line from
 L<STDIN|https://en.wikipedia.org/wiki/Standard_streams#Standard_input_.28stdin.29>,
-removing the trailing new line, calling L<val|/routine/val> on it and returning
-the resultant string or the appropriate L<allomorph|/language/glossary#Allomorph>.
-Returns L<Nil|/type/Nil> on EOF.
+removing the trailing new line, and returning the resultant string.
 
 =for code
 my $name = prompt "What's your name? ";