nixos/doc: render option values using `lib.generators.toPretty`

Render un`_type`d defaults and examples as `literalExpression`s using
`lib.generators.toPretty` so that consumers don't have to reinvent Nix
pretty-printing. `renderOptionValue` is kept internal for now intentionally.

Make `toPretty` print floats as valid Nix values (without a tilde).

Get rid of the now-obsolete `substSpecial` function.

Move towards disallowing evaluation of packages in the manual by
raising a warning on `pkgs.foo.{outPath,drvPath}`; later, this should
throw an error. Instead, module authors should use `literalExpression`
and `mkPackageOption`.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/tests/misc.nix b/lib/tests/misc.nix
index cfad5a3cd92a0..648c05ab35720 100644
--- a/lib/tests/misc.nix
+++ b/lib/tests/misc.nix
@@ -741,7 +741,7 @@ runTests {
     };
     expected = rec {
       int = "42";
-      float = "~0.133700";
+      float = "0.1337";
       bool = "true";
       emptystring = ''""'';
       string = ''"fn\''${o}\"r\\d"'';