doc: remove cleared todo comment

src/widget/node2buffer.zig

@@ -1,4 +1,4 @@
-///! Transform a given `zmd.Note` into a buffer which can be used by any `vaxis.widgets.View`
+///! Transform a given `zmd.Node` into a buffer which can be used by any `vaxis.widgets.View`
 const std = @import("std");
 const vaxis = @import("vaxis");
 const zmd = @import("zmd");
@@ -16,7 +16,6 @@ pub fn toBuffer(
     var next_start: ?usize = start;
     var style = sty;
     // FIXME: support list display
-    // TODO: improve code block listings (i.e. add line numbers with corresponding separator, etc.)
 
     // determine general styling changes
     switch (node.token.element.type) {