Minor update paper.md

Author: rohanbabbar04

joss/paper.md

@@ -146,11 +146,15 @@ solvers can be found within the submodule `pylops_mpi.optimization`.
 PyLops-MPI Linear Operators typically utilize halo exchange to facilitate operations at each rank. We encourage users to
 ensure that the local data shapes at each rank are consistent to enable matrix-vector products without requiring
 external communication. However, if the local shapes of the data and model at each rank do not match during these
-operations, the operator performs a halo exchange, transferring data cells (commonly referred to as "ghost cells") from
-neighboring processes. This process ensures that the model vector and data vector shapes at each rank are correctly
-aligned for the operation. Consequently, this data transfer enables efficient local computations without the need for
-explicit inter-process communication, thereby avoiding heavy communication overhead.
+operations, the operator performs a halo exchange, transferring boundary data cells (commonly referred to as "ghost
+cells") to/from neighboring processes. This process ensures that the model vector and data vector shapes at each rank
+are correctly aligned for the operation. Consequently, this data transfer enables efficient local computations without
+the need for explicit inter-process communication, thereby avoiding heavy communication overhead.
 
 # Use Cases
 
+- *Post Stack Inversion - 3D* - 
+
+- *Least-Squares Seismic Migration* - 
+
 # References