docs(material/tooltip): fix tooltip-position-at-origin example overflow (#33218)

Reduces the demo button size from 500×500px to 200×200px to prevent the
example from overflowing on small screens.

Author: swseverance

src/components-examples/material/tooltip/tooltip-position-at-origin/tooltip-position-at-origin-example.css

@@ -1,8 +1,5 @@
 button.demo-button {
-  width: 500px;
-  height: 500px;
-}
-
-.example-enabled-checkbox {
-  margin-left: 8px;
+  width: 200px;
+  height: 200px;
+  margin: 0 8px 8px 0;
 }