update docs for changevein

docs/plugins/changevein.rst

@@ -1,10 +1,23 @@
 changevein
 ==========
-Changes material of the vein under cursor to the specified inorganic RAW
-material. Only affects tiles within the current 16x16 block - for veins and
-large clusters, you will need to use this command multiple times.
 
-Example:
+Tags:
+:dfhack-keybind:
 
-``changevein NATIVE_PLATINUM``
+Changes the material of a mineral inclusion. You can change it to any incorganic
-   Convert vein at cursor position into platinum ore.
+material RAW id. Note that this command only affects tiles within the current
+16x16 block - for large veins and clusters, you will need to use this command
+multiple times.
+
+You can use the `probe` command to discover the material RAW ids for existing
+veins that you want to duplicate.
+
+Usage::
+
+    changevein <material RAW id>
+
+Example
+-------
+
+- ``changevein NATIVE_PLATINUM``
+    Convert vein at cursor position into platinum ore.

plugins/changevein.cpp

@@ -86,8 +86,7 @@ DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <Plug
 {
     commands.push_back(PluginCommand("changevein",
         "Changes the material of a mineral inclusion.",
-        df_changevein, false,
+        df_changevein));
-        "Syntax: changevein <inorganic material ID>\n"));
     return CR_OK;
 }