Update documentations #30655

Author: NamjaeChoi

framework/doc/content/syntax/Kokkos/index.md

@@ -447,6 +447,9 @@ The following objects are currently available in Kokkos-MOOSE:
 - [Materials](syntax/KokkosMaterials/index.md)
 - [AuxKernels](syntax/KokkosAuxKernels/index.md)
 - [Functions](syntax/KokkosFunctions/index.md)
+- [Postprocessors](syntax/KokkosPostprocessors/index.md)
+- [VectorPostprocessors](syntax/KokkosVectorPostprocessors/index.md)
+- [Reporters](syntax/KokkosReporters/index.md)
 
 !if-end!