Revert "Update static-caching.md (#1396)" (#1397)

This reverts commit 7399a64.

Author: duncanmcclean

content/collections/docs/static-caching.md

@@ -389,7 +389,13 @@ return [
                     ]
                 ]
             ],
-            'navigation' => 'all'
+            'navigation' => [
+                'links' => [
+                    'urls' => [
+                        '/*'
+                    ]
+                ]
+            ]
         ]
     ]
 ];
@@ -400,7 +406,7 @@ return [
 - “when an entry in the blog collection is saved, we should invalidate the /blog page, any pages beginning with /blog/category/, and the home page.”
 - “when a term in the tags taxonomy is saved, we should invalidate those same pages”
 - “when the settings global set is saved, we invalidate all urls”
-- “when any of the navigations are saved, we invalidate all urls”
+- “when the links navigation is saved, we invalidate all urls”
 
 You may add as many collections and taxonomies as you need.