docs(material/tooltip): missing positionAtOrigin documentation (#27134)

add description for Input('matTooltipPositionAtOrigin')

(cherry picked from commit 4bce5cb)

Author: naaajii

src/material/tooltip/tooltip.ts

@@ -200,6 +200,10 @@ export abstract class _MatTooltipBase<T extends _TooltipComponentBase>
     }
   }
 
+  /**
+   * Whether tooltip should be relative to the click or touch origin
+   * instead of outside the element bounding box.
+   */
   @Input('matTooltipPositionAtOrigin')
   get positionAtOrigin(): boolean {
     return this._positionAtOrigin;

tools/public_api_guard/material/tooltip.md

@@ -107,7 +107,6 @@ export abstract class _MatTooltipBase<T extends _TooltipComponentBase> implement
     _overlayRef: OverlayRef | null;
     get position(): TooltipPosition;
     set position(value: TooltipPosition);
-    // (undocumented)
     get positionAtOrigin(): boolean;
     set positionAtOrigin(value: BooleanInput);
     show(delay?: number, origin?: {