Docs: minor fix in mermaid diagram

Author: MischaPanch

docs/02_deep_dives/L1_Batch.ipynb

@@ -164,8 +164,8 @@
     "\n",
     "```mermaid\n",
     "graph LR\n",
-    "    A[Environment] -->|ObsBatchProtocol| B[Collector]\n",
-    "    B -->|RolloutBatchProtocol| C[Replay Buffer]\n",
+    "    A[Collector] -->|ActBatchProtocol| B[Environment]\n",
+    "    B[Environment + Action] -->|RolloutBatchProtocol| C[Replay Buffer]\n",
     "    C -->|RolloutBatchProtocol| D[Policy]\n",
     "    D -->|ActBatchProtocol| A\n",
     "    D -->|BatchWithAdvantages| E[Algorithm/Trainer]\n",