fix docstring

netket/sampler/metropolis.py

@@ -447,7 +447,7 @@ def MetropolisHamiltonian(hilbert, hamiltonian, *args, **kwargs) -> MetropolisSa
     Notice that this sampler preserves by construction all the symmetries
     of the Hamiltonian. This is in generally not true for the local samplers instead.
 
-    This samapler only works on the CPU. To use the Hamiltonian smapler with GPUs,
+    This sampler only works on the CPU. To use the Hamiltonian smapler with GPUs,
     you should use :class:`netket.sampler.MetropolisHamiltonianNumpy`
 
     Args: