Fix broken links in README's Suite of Physics-Informed ML Models section (#1303)

Signed-off-by: Andrew Brumbelow <andrewbrumbelow@gmail.com>

Author: Brumbelow

CHANGELOG.md

@@ -85,6 +85,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed bug in Pangu, FengWu attention window shift for asymmetric longitudes
 - Fixed a bug in `mesh.sampling.find_nearest_cells`, where a mixup between L2 and L-inf norms
   could cause slightly incorrect nearest-neighbor assignments in highly skewed meshes.
+- Fixed broken links in the "A Suite of Physics-Informed ML Models" section of the
+  top-level `README.md` (closes #1303).
 
 ### Security
 

README.md

@@ -126,14 +126,14 @@ Neural Operators:
 - [Fourier Neural Operators (FNOs)](physicsnemo/models/fno)
 - [DeepONet](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-sym/user_guide/neural_operators/deeponet.html)
 - [DoMINO](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/cfd/external_aerodynamics/domino/readme.html)
-- [Graph Neural Networks (GNNs)](physicsnemo/models/gnn_layers)
-- [MeshGraphNet](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/cfd/vortex_shedding_mgn/readme.html)
-- [MeshGraphNet for Lagrangian](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/cfd/lagrangian_mgn/readme.html)
-- [XAeroNet](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/cfd/external_aerodynamics/xaeronet/readme.html)
+- [Graph Neural Networks (GNNs)](physicsnemo/nn/module/gnn_layers)
+- [MeshGraphNet](https://github.com/NVIDIA/physicsnemo/tree/main/examples/cfd/vortex_shedding_mgn)
+- [MeshGraphNet for Lagrangian](https://github.com/NVIDIA/physicsnemo/tree/main/examples/cfd/lagrangian_mgn)
+- [XAeroNet](https://github.com/NVIDIA/physicsnemo/tree/main/examples/cfd/external_aerodynamics/xaeronet)
 - [Diffusion Models](physicsnemo/models/diffusion)
-- [Correction Diffusion Model](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/generative/corrdiff/readme.html)
-- [DDPM](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/generative/diffusion/readme.html)
-- [PhysicsNeMo GraphCast](https://docs.nvidia.com/deeplearning/physicsnemo/physicsnemo-core/examples/weather/graphcast/readme.html)
+- [Correction Diffusion Model](https://github.com/NVIDIA/physicsnemo/tree/main/examples/weather/corrdiff)
+- [DDPM](https://github.com/NVIDIA/physicsnemo/tree/main/examples/cfd/flow_reconstruction_diffusion)
+- [PhysicsNeMo GraphCast](https://github.com/NVIDIA/physicsnemo/tree/main/examples/weather/graphcast)
 - [Transsolver](https://github.com/NVIDIA/physicsnemo/tree/main/examples/cfd/darcy_transolver)
 - [RNNs](https://github.com/NVIDIA/physicsnemo/tree/main/physicsnemo/models)
 - [SwinVRNN](https://github.com/NVIDIA/physicsnemo/tree/main/physicsnemo/models/swinvrnn)