docs: change phrasing after review

apps/emqx_bridge_kafka/README.md

@@ -27,4 +27,4 @@ Please see our [contributing.md](../../CONTRIBUTING.md).
 
 # License
 
-See [BSL](./BSL.txt).
+EMQ Business Source License 1.1, refer to [LICENSE](BSL.txt).

apps/emqx_bridge_pulsar/README.md

@@ -27,4 +27,4 @@ Please see our [contributing.md](../../CONTRIBUTING.md).
 
 # License
 
-See [BSL](./BSL.txt).
+EMQ Business Source License 1.1, refer to [LICENSE](BSL.txt).