vte3: generate API docs

Closes #35668.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Formula/vte3.rb

@@ -11,6 +11,7 @@ class Vte3 < Formula
   end
 
   depends_on "gobject-introspection" => :build
+  depends_on "gtk-doc" => :build
   depends_on "intltool" => :build
   depends_on "pkg-config" => :build
   depends_on "gettext"
@@ -20,14 +21,15 @@ class Vte3 < Formula
   depends_on "vala"
 
   def install
+    ENV["XML_CATALOG_FILES"] = "#{etc}/xml/catalog"
+
     args = [
       "--disable-dependency-tracking",
       "--prefix=#{prefix}",
       "--disable-Bsymbolic",
       "--enable-introspection=yes",
-      "--enable-gnome-pty-helper",
+      "--enable-gtk-doc",
     ]
-
     system "./configure", *args
     system "make", "install"
   end