cairo: Add missing doc aliases

Author: bilelmoussaoui

cairo/src/context.rs

@@ -53,6 +53,7 @@ impl fmt::Debug for RectangleList {
 
 #[derive(Debug)]
 #[repr(transparent)]
+#[doc(alias = "cairo_t")]
 pub struct Context(ptr::NonNull<ffi::cairo_t>);
 
 #[cfg(feature = "use_glib")]

cairo/src/paths.rs

@@ -5,6 +5,7 @@ use std::{iter::FusedIterator, ptr};
 use crate::{ffi, PathDataType};
 
 #[derive(Debug)]
+#[doc(alias = "cairo_path_t")]
 pub struct Path(ptr::NonNull<ffi::cairo_path_t>);
 
 impl Path {

cairo/src/region.rs

@@ -11,6 +11,7 @@ use crate::{ffi, utils::status_to_result, Error, RectangleInt, RegionOverlap};
 
 #[derive(Debug)]
 #[repr(transparent)]
+#[doc(alias = "cairo_region_t")]
 pub struct Region(ptr::NonNull<ffi::cairo_region_t>);
 
 #[cfg(feature = "use_glib")]