Update main documentation

main/footer.js

@@ -1,7 +1,7 @@
 function writeHeader() {
-    document.write('Version 1.14.2-dev20');
+    document.write('Version 1.14.2-dev21');
 };
 
 function writeFooter()  {
-    document.write('Generated on Fri Nov  4 2022 08:05:50 for CMSIS-DSP 1.14.2-dev20+g989370f. Copyright © 2022 Arm Limited (or its affiliates). All rights reserved.');
+    document.write('Generated on Fri Nov  4 2022 08:42:10 for CMSIS-DSP 1.14.2-dev21+gdb4253f. Copyright © 2022 Arm Limited (or its affiliates). All rights reserved.');
 };

version.js

@@ -1,7 +1,7 @@
 //--- list of versions ---
 const versions = {
     "latest": "1.14.2",
-    "main": "1.14.2-dev20",
+    "main": "1.14.2-dev21",
     "v1.14.1": "1.14.1",
     "v1.14.0": "1.14.0",
     "v1.12.0": "1.12.0",