kv: fix spelling of "interceptor" in file name

All other file names and code objects have the correct spelling.

Release justification: None.

Release note: None.

pkg/kv/kvclient/kvcoord/BUILD.bazel

@@ -134,9 +134,9 @@ go_test(
         "txn_coord_sender_server_test.go",
         "txn_coord_sender_test.go",
         "txn_correctness_test.go",
-        "txn_intercepter_pipeliner_client_test.go",
         "txn_interceptor_committer_test.go",
         "txn_interceptor_heartbeater_test.go",
+        "txn_interceptor_pipeliner_client_test.go",
         "txn_interceptor_pipeliner_test.go",
         "txn_interceptor_seq_num_allocator_test.go",
         "txn_interceptor_span_refresher_test.go",