[Doc] Trivial correction for shard allocator choice (#106216)

Relates: #105894

docs/reference/cluster/nodes-stats.asciidoc

@@ -2821,7 +2821,7 @@ The number of shards currently allocated to this node
 `undesired_shards`::
 (integer)
 The amount of shards that are scheduled to be moved elsewhere in the cluster
-or -1 other than desired balance allocator is used
+if desired balance allocator is used or -1 if any other allocator is used.
 
 `forecasted_ingest_load`::
 (double)