Prevent anchors in tooltip example from splitting across lines

So as to decrease the number of future inquiries about said edge case (which is already documented).
Refs #18304
[skip sauce]

docs/assets/scss/_component-examples.scss

@@ -266,6 +266,10 @@
 }
 
 // Tooltips
+.tooltip-demo a {
+  white-space: nowrap;
+}
+
 .bd-example-tooltip-static .tooltip {
   position: relative;
   display: inline-block;