fix: update command on docs and logic (#4946)

openclaw/README.md

@@ -60,6 +60,12 @@ openclaw --version
 
 > **Note:** OpenClaw memory plugins load through an exclusive slot, so install alone does not activate the plugin. You must set `plugins.slots.memory` as shown above.
 
+### Updating the plugin to get the latest features and fixes:
+
+```bash
+openclaw plugins update openclaw-mem0
+```
+
 ### Open-Source (Self-hosted)
 
 No Mem0 key needed. Vectors are stored locally in SQLite at `~/.mem0/vector_store.db` — no external database required.
@@ -257,7 +263,7 @@ openclaw mem0 help --json                                   # discover all comma
 | `autoRecall` | `boolean` | `false` | Inject relevant memories before each turn |
 | `autoCapture` | `boolean` | `false` | Extract and store facts after each turn |
 | `topK` | `number` | `5` | Max memories returned per recall |
-| `searchThreshold` | `number` | `0.5` | Minimum similarity score (0-1) |
+| `searchThreshold` | `number` | `0.3` | Minimum similarity score (0-1) |
 
 ### Platform Mode