fix some comments

Author: jelbourn

src/cdk/overlay/position/connected-position-strategy.ts

@@ -90,15 +90,14 @@ export class ConnectedPositionStrategy implements PositionStrategy {
     this._pane = overlayRef.overlayElement;
   }
 
-  /** To be used to for any cleanup after the element gets destroyed. */
+  /** Performs any cleanup after the element is destroyed. */
   dispose() { }
 
   /**
    * Updates the position of the overlay element, using whichever preferred position relative
    * to the origin fits on-screen.
    * @docs-private
    *
-   * @param element Element to which to apply the CSS styles.
    * @returns Resolves when the styles have been applied.
    */
   apply(): void {

src/cdk/overlay/position/global-position-strategy.ts

@@ -168,9 +168,7 @@ export class GlobalPositionStrategy implements PositionStrategy {
     parentStyles.alignItems = this._alignItems;
   }
 
-  /**
-   * Removes the wrapper element from the DOM.
-   */
+  /** Removes the wrapper element from the DOM. */
   dispose(): void {
     if (this._wrapper && this._wrapper.parentNode) {
       this._wrapper.parentNode.removeChild(this._wrapper);