[MLIR][shard] Fix tblgen description of shard.neighbors_linear_indices (llvm#163409)

This PR fixed an issue where inline code blocks in the ODS description of `shard.neighbors_linear_indices` were not properly closed.

Author: jackalcooper

mlir/include/mlir/Dialect/Shard/IR/ShardOps.td

@@ -174,7 +174,7 @@ def Shard_NeighborsLinearIndicesOp : Shard_Op<"neighbors_linear_indices", [
     ```
     The above returns two indices, `633` and `693`, which correspond to the
     index of the previous process `(1, 1, 3)`, and the next process 
-    `(1, 3, 3) along the split axis `1`.
+    `(1, 3, 3)` along the split axis `1`.
 
     A negative value is returned if there is no neighbor in the respective
     direction along the given `split_axes`.