docs(material/sidenav): fix typo in drawer comment (#32702)

Fix "importatnt" -> "important" in the drawer animation comment.

Author: MathieuAbbal

src/material/sidenav/drawer.ts

@@ -569,7 +569,7 @@ export class MatDrawer implements AfterViewInit, OnDestroy {
     this._opened.set(isOpen);
 
     if (this._container?._transitionsEnabled) {
-      // Note: it's importatnt to set this as early as possible,
+      // Note: it's important to set this as early as possible,
       // otherwise the animation can look glitchy in some cases.
       this._setIsAnimating(true);
     } else {