how to add tooltip in angular for multiple items in an object
<mat-card>
<button mat-raised-button #tooltip="matTooltip"
matTooltip="Manually triggered tooltip">
Manual Tooltip
</button>
<button mat-button
(click)="tooltip.show()">
show
</button>
<button mat-button
(click)="tooltip.hide()">
hide
</button>
<button mat-button
(click)="tooltip.toggle()">
toggle
</button>
</mat-card>