Add 3.16 as latest; change 3.15 to number

Author: josh-wong

docusaurus.config.js

@@ -75,9 +75,15 @@ const config = {
               },
               */
               current: { // When a new version is released and this is no longer the current version, change this to the version number and then delete this comment.
-                label: '3.15',
+                label: '3.16',
                 path: 'latest', // When a new version is released and this is no longer the current version, change this to the version number and then delete this comment.
                 banner: 'none',
+                className: '3.16.0',
+              },
+              "3.15": { // When a new version is released and this is no longer the current version, change this to the version number and then delete this comment.
+                label: '3.15',
+                path: '3.15', // When a new version is released and this is no longer the current version, change this to the version number and then delete this comment.
+                banner: 'none',
                 className: '3.15.3',
               },
               "3.14": { // When a new version is released and this is no longer the current version, change this to the version number and then delete this comment.