Add links to ADIOS2 documentation in comments

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

examples/10_streaming_write.cpp

@@ -87,6 +87,7 @@ 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

@@ -87,6 +87,7 @@ void WriteDataset::call(ADIOS2File &ba, detail::BufferedPut &bp)
                 adios2::Variable<T> var = ba.m_impl->verifyDataset<T>(
                     bp.param.offset, bp.param.extent, ba.m_IO, bp.name);
 
+                // 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})
@@ -160,6 +161,7 @@ struct RunUniquePtrPut
         auto ptr = static_cast<T const *>(bufferedPut.data.get());
         adios2::Variable<T> var = ba.m_impl->verifyDataset<T>(
             bufferedPut.offset, bufferedPut.extent, ba.m_IO, bufferedPut.name);
+        // https://adios2.readthedocs.io/en/v2.9.2/components/components.html#shapes
         if (var.Shape() == adios2::Dims{adios2::LocalValueDim})
         {
             if (bufferedPut.extent != Extent{1})