Update triggerText to be an ng-content

Author: youda97

src/dialog/tooltip/tooltip-definition.component.ts

@@ -3,7 +3,9 @@ import { Component, Input, HostBinding } from "@angular/core";
 @Component({
 	selector: "ibm-tooltip-definition",
 	template: `
-		<button class="bx--tooltip__trigger" [attr.aria-describedby]="id">{{triggerText}}</button>
+		<button class="bx--tooltip__trigger" [attr.aria-describedby]="id">
+			<ng-content></ng-content>
+		</button>
 		<div
 			[id]="id"
 			[ngClass]="{
@@ -22,10 +24,6 @@ export class TooltipDefinition {
 
 	@Input() id = `definition-tooltip-${TooltipDefinition.tooltipItemCount}`;
 	/**
-     * The content to put into the trigger.
-     */
-	@Input() triggerText: string;
-	/**
 	 * Body content for the `TooltipDefinition`.
 	 */
 	@Input() content: string;

src/dialog/tooltip/tooltip.stories.ts

@@ -122,9 +122,9 @@ storiesOf("Tooltip", module)
 	.add("Definition tooltip", () => ({
 		template: `
 			<ibm-tooltip-definition
-				[triggerText]="triggerText"
 				[content]="content"
 				[placement]="placement">
+				{{triggerText}}
 			</ibm-tooltip-definition>
 		`,
 		props: {