Fix reference

README.md

@@ -82,7 +82,7 @@ python3 -m pip install adios4dolfinx[test]@git+https://github.com/jorgensd/adios
 The repository contains many documented examples of usage, in the `docs`-folder, including
 - [Reading and writing mesh checkpoints](./docs/writing_mesh_checkpoint.py)
 - [Storing mesh partitioning data](./docs/partitioned_mesh.py)
-- [Writing mesh-tags to a checkpoint](./docs/meshtags.py.py)
+- [Writing mesh-tags to a checkpoint](./docs/meshtags.py)
 - [Reading and writing function checkpoints](./docs/writing_functions_checkpoint.py)
 - [Checkpoint on input mesh](./docs/original_checkpoint.py)
 Further examples can be found at [ADIOS4DOLFINx examples](https://jsdokken.com/adios4dolfinx/)