docs(material/tooltip): update tooltip-delay example layout styles (#33098)

fixes a layout issue where elements were crowded together without
horizontal or vertical space between them

(cherry picked from commit af49eee)

Author: swseverance

src/components-examples/material/tooltip/tooltip-delay/tooltip-delay-example.css

@@ -1,4 +1,3 @@
-.mat-form-field + .mat-form-field,
-.mat-raised-button {
-  margin-left: 8px;
+.example-user-input {
+  margin: 0 8px 8px 0;
 }