Add links to ADIOS2 documentation in comments

Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja>

Author: franzpoeschel

examples/10_streaming_write.cpp

@@ -92,6 +92,7 @@ int main()
         // fully interconnected communication meshes for data that needs to be
         // read by each reader. A local value dataset can only contain a single
         // item per MPI rank, forming an array of length equal to the MPI size.
+        // https://adios2.readthedocs.io/en/v2.9.2/components/components.html#shapes
 
         auto e_patches = iteration.particles["e"].particlePatches;
         auto numParticles = e_patches["numParticles"];

src/IO/ADIOS/ADIOS2File.cpp

@@ -109,6 +109,7 @@ void WriteDataset::call(ADIOS2File &ba, detail::BufferedPut &bp)
                     std::nullopt,
                     ba.variables());
 
+                // https://adios2.readthedocs.io/en/v2.9.2/components/components.html#shapes
                 if (var.Shape() == adios2::Dims{adios2::LocalValueDim})
                 {
                     if (bp.param.extent != Extent{1})
@@ -196,6 +197,7 @@ struct RunUniquePtrPut
             bufferedPut.name,
             std::nullopt,
             ba.variables());
+        // https://adios2.readthedocs.io/en/v2.9.2/components/components.html#shapes
         if (var.Shape() == adios2::Dims{adios2::LocalValueDim})
         {
             if (bufferedPut.extent != Extent{1})