Update main documentation

main/footer.js

@@ -1,7 +1,7 @@
 function writeHeader() {
-    document.write('Version 1.13.1-dev1');
+    document.write('Version 1.13.1-dev2');
 };
 
 function writeFooter()  {
-    document.write('Generated on Wed Sep 14 2022 08:59:16 for CMSIS-DSP 1.13.1-dev1+g142dcec. Copyright © 2022 Arm Limited (or its affiliates). All rights reserved.');
+    document.write('Generated on Tue Sep 20 2022 06:00:16 for CMSIS-DSP 1.13.1-dev2+gb817710. Copyright © 2022 Arm Limited (or its affiliates). All rights reserved.');
 };

version.js

@@ -1,6 +1,6 @@
 //--- list of versions ---
 const versions = {
-    "main": "1.13.1-dev1",
+    "main": "1.13.1-dev2",
     "latest": "1.12.0",
     "v1.11.0": "1.11.0",
     "v1.10.1": "1.10.1"