Make Options::tessellation_options public

Closes https://github.com/emilk/egui/issues/644

epaint/src/tessellator.rs

@@ -238,7 +238,8 @@ pub struct TessellationOptions {
     /// Size of a pixel in points, e.g. 0.5, or larger if you want more blurry edges.
     pub aa_size: f32,
     /// Anti-aliasing makes shapes appear smoother, but requires more triangles and is therefore slower.
-    /// By default this is enabled in release builds and disabled in debug builds.
+    /// This setting does not affect text.
+    /// Default: `true`.
     pub anti_alias: bool,
     /// If `true` (default) cull certain primitives before tessellating them
     pub coarse_tessellation_culling: bool,