Create clearAllAuctions.md (#5473)

* Create clearAllAuctions.md

prebid/Prebid.js#11912

* Update clearAllAuctions.md

dev-docs/publisher-api-reference/clearAllAuctions.md

@@ -0,0 +1,31 @@
+---
+layout: api_prebidjs
+title: pbjs.clearAllAuctions
+description:
+sidebarType: 1
+---
+
+
+Utility to clear all ad units of bids. This is useful for testing or to clear caches in a single page application.
+
+```javascript
+// Function to call when the URL changes
+function onUrlChange() {
+    pbjs.clearAllAuctions();
+}
+
+// Function to initialize the URL change listener
+function initUrlChangeListener() {
+    // Listen for changes to the history state
+    window.addEventListener('popstate', onUrlChange);
+
+    // Optionally, you might want to handle the initial load as well
+    onUrlChange();
+}
+
+// Call the function to set up the listener
+initUrlChangeListener();
+
+```
+
+<hr class="full-rule" />