treewide: automatically md-convert option descriptions

the conversion procedure is simple:

 - find all things that look like options, ie calls to either `mkOption`
   or `lib.mkOption` that take an attrset. remember the attrset as the
   option
 - for all options, find a `description` attribute who's value is not a
   call to `mdDoc` or `lib.mdDoc`
 - textually convert the entire value of the attribute to MD with a few
   simple regexes (the set from mdize-module.sh)
 - if the change produced a change in the manual output, discard
 - if the change kept the manual unchanged, add some text to the
   description to make sure we've actually found an option. if the
   manual changes this time, keep the converted description

this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.

1 files changed, 8 insertions, 8 deletions

diff --git a/nixos/modules/services/monitoring/statsd.nix b/nixos/modules/services/monitoring/statsd.nix
index 30b2916a992..d109e082620 100644
--- a/nixos/modules/services/monitoring/statsd.nix
+++ b/nixos/modules/services/monitoring/statsd.nix
@@ -59,31 +59,31 @@ in
     enable = mkEnableOption "statsd";
 
     listenAddress = mkOption {
-      description = "Address that statsd listens on over UDP";
+      description = lib.mdDoc "Address that statsd listens on over UDP";
       default = "127.0.0.1";
       type = types.str;
     };
 
     port = mkOption {
-      description = "Port that stats listens for messages on over UDP";
+      description = lib.mdDoc "Port that stats listens for messages on over UDP";
       default = 8125;
       type = types.int;
     };
 
     mgmt_address = mkOption {
-      description = "Address to run management TCP interface on";
+      description = lib.mdDoc "Address to run management TCP interface on";
       default = "127.0.0.1";
       type = types.str;
     };
 
     mgmt_port = mkOption {
-      description = "Port to run the management TCP interface on";
+      description = lib.mdDoc "Port to run the management TCP interface on";
       default = 8126;
       type = types.int;
     };
 
     backends = mkOption {
-      description = "List of backends statsd will use for data persistence";
+      description = lib.mdDoc "List of backends statsd will use for data persistence";
       default = [];
       example = [
         "graphite"
@@ -97,19 +97,19 @@ in
     };
 
     graphiteHost = mkOption {
-      description = "Hostname or IP of Graphite server";
+      description = lib.mdDoc "Hostname or IP of Graphite server";
       default = null;
       type = types.nullOr types.str;
     };
 
     graphitePort = mkOption {
-      description = "Port of Graphite server (i.e. carbon-cache).";
+      description = lib.mdDoc "Port of Graphite server (i.e. carbon-cache).";
       default = null;
       type = types.nullOr types.int;
     };
 
     extraConfig = mkOption {
-      description = "Extra configuration options for statsd";
+      description = lib.mdDoc "Extra configuration options for statsd";
       default = "";
       type = types.nullOr types.str;
     };