Adds dependence to avoid test error

Also adds links and some explanations. This closes Raku#2383 closes Raku#2385

META6.json

@@ -8,16 +8,17 @@
   "build-depends": [
     "File::Find"
   ],
-  "depends": [
-    "LWP::Simple:ver<0.101+>",
-    "URI",
-    "File::Temp",
-    "JSON::Fast",
-    "Pod::To::BigPage:ver<0.4.0+>",
-    "Pod::To::HTML:ver<0.3.19+>",
-    "OO::Monitors",
-    "File::Find",
-    "Test::META"
+    "depends": [
+	"IO::Socket::SSL",
+	"LWP::Simple:ver<0.101+>",
+	"URI",
+	"File::Temp",
+	"JSON::Fast",
+	"Pod::To::BigPage:ver<0.4.0+>",
+	"Pod::To::HTML:ver<0.3.19+>",
+	"OO::Monitors",
+	"File::Find",
+	"Test::META"
   ],
   "tags": [
       "perl6","pod6","documentation", "reference"

doc/Type/IO.pod6

@@ -304,11 +304,14 @@ Defined as:
     multi sub slurp(IO::Handle:D $fh = $*ARGFILES, |c)
     multi sub slurp(IO() $path, |c)
 
-Slurps the contents of the entire file into a C<Str> (or C<Buf> if C<:bin>).
-Accepts C<:bin> and C<:enc> optional named parameters, with the same meaning
-as L<open()|/routine/open>.  The routine will C<fail> if the file does not
-exist, or is a directory. Without any arguments, sub C<slurp> operates on
-C<$*ARGFILES>, which defaults to C<$*IN> in the absence of any filenames.
+Slurps the contents of the entire file into a C<Str> (or C<Buf> if
+C<:bin>). Accepts C<:bin> and C<:enc> optional named parameters, with
+the same meaning as L<open()|/routine/open>; possible encodings are the
+same as in all the other C<IO> methods and are listed in
+L<C<encoding>|/type/IO::Handle#method_encoding> routine.  The routine
+will C<fail> if the file does not exist, or is a directory. Without any
+arguments, sub C<slurp> operates on C<$*ARGFILES>, which defaults to
+C<$*IN> in the absence of any filenames.
 
 =begin code :skip-test
 # read entire file as (Unicode) Str