Man: Move compile-targets to the support section

This command shouldn't be considered legacy.

src/odoc/bin/main.ml

@@ -871,7 +871,7 @@ let () =
       Odoc_manpage.targets ~docs:section_support;
       Odoc_latex.targets ~docs:section_support;
       Depends.Compile.(cmd, info ~docs:section_support);
-      Targets.Compile.(cmd, info ~docs:section_legacy);
+      Targets.Compile.(cmd, info ~docs:section_support);
       Html_fragment.(cmd, info ~docs:section_legacy);
       Odoc_html.process ~docs:section_legacy;
       Odoc_manpage.process ~docs:section_legacy;