docs(changelog): fix wrong description (#8945)

Author: rafaelss95

CHANGELOG.md

@@ -8,7 +8,7 @@
 * **autosize:** not updating when window is resized ([#8619](https://github.com/angular/material2/issues/8619)) ([b8664b8](https://github.com/angular/material2/commit/b8664b8)), closes [#8610](https://github.com/angular/material2/issues/8610)
 * **autosize:** remove resize handle ([#8621](https://github.com/angular/material2/issues/8621)) ([0d2a419](https://github.com/angular/material2/commit/0d2a419))
 * **overlay:** export OverlaySizeConfig ([#8932](https://github.com/angular/material2/issues/8932)) ([a626c8f](https://github.com/angular/material2/commit/a626c8f))
-* **portal:** inaccurate hasAttahed result and portal being cleared if attached too early ([#8642](https://github.com/angular/material2/issues/8642)) ([b488b39](https://github.com/angular/material2/commit/b488b39)), closes [/github.com/angular/material2/blob/master/src/lib/dialog/dialog-container.ts#L118](https://github.com//github.com/angular/material2/blob/master/src/lib/dialog/dialog-container.ts/issues/L118) [#8628](https://github.com/angular/material2/issues/8628)
+* **portal:** inaccurate hasAttached result and portal being cleared if attached too early ([#8642](https://github.com/angular/material2/issues/8642)) ([b488b39](https://github.com/angular/material2/commit/b488b39)), closes [#8628](https://github.com/angular/material2/issues/8628)
 * **select,input:** inconsistent disabled text color ([#7794](https://github.com/angular/material2/issues/7794)) ([f31be6f](https://github.com/angular/material2/commit/f31be6f)), closes [#7793](https://github.com/angular/material2/issues/7793)
 * **tooltip:** not closing when scrolling away ([#8688](https://github.com/angular/material2/issues/8688)) ([d5a2fca](https://github.com/angular/material2/commit/d5a2fca))
 
@@ -206,7 +206,7 @@ StackBlitz instead of Plunker.
     ```ts
     // Before
     scrollDispatcher.scrolled(50, () => ...);
-    
+
     // After
     scrollDispatcher.scrolled(50).subscribe(() => ...);
     ```