Update examples/3d_ising_partition_function/main.jl

Co-authored-by: Lukas Devos <ldevos98@gmail.com>

Author: pbrehmer

examples/3d_ising_partition_function/main.jl

@@ -178,7 +178,7 @@ this function. This can be done using the [`PEPSKit.hook_pullback`](@ref) functi
 PEPSKit.jl, which allows to hook into the pullback of a given function by specifying a
 specific algorithm for the pullback computation. Here, we opted to use an Arnoldi method to
 solve the linear problem defining the gradient of the network contraction at its fixed
-point. This is exactly the workflow underlying [`PEPSKit.fixedpoint`](@ref) internally, and
+point. This is exactly the workflow that internally underlies [`PEPSKit.fixedpoint`](@ref), and
 more info on particular gradient algorithms can be found in the corresponding docstring.
 
 ### Characterizing the optimization manifold