Fix description of leader change errors (#2602)

Author: songqing

docs-2.0-en/reuse/source-monitoring-metrics.md

@@ -12,7 +12,7 @@
 | `num_killed_queries`                             | The number of killed queries.                                |
 | `num_opened_sessions`                            | The number of sessions connected to the server.              |
 | `num_queries`                                    | The number of queries.                                       |
-| `num_query_errors_leader_changes`                | The number of the raft leader changes due to query errors.            |
+| `num_query_errors_leader_changes`                | The number of query errors due to the raft leader changes.            |
 | `num_query_errors`                               | The number of query errors.                                   |
 | `num_reclaimed_expired_sessions`                 | The number of expired sessions actively reclaimed by the server. |
 | `num_rpc_sent_to_metad_failed`                   | The number of failed RPC requests that the Graphd service sent to the Metad service. |
@@ -137,7 +137,7 @@
 | `query_latency_us`                               | The latency of queries.                             |
 | `num_slow_queries`                               | The number of slow queries.                              |
 | `num_query_errors`                               | The number of query errors.                            |
-| `num_query_errors_leader_changes`                | The number of raft leader changes due to query errors.      |
+| `num_query_errors_leader_changes`                | The number of query errors due to raft leader changes.      |
 | `num_killed_queries`                             | The number of killed queries.                        |
 | `num_aggregate_executors`                        | The number of executions for the Aggregation operator.               |
 | `num_sort_executors`                             | The number of executions for the Sort operator.                     |

docs-2.0-zh/reuse/source-monitoring-metrics.md

@@ -12,7 +12,7 @@
 | `num_killed_queries`                             | 被终止的查询数量。                        |
 | `num_opened_sessions`                            | 服务端建立过的会话数量。                  |
 | `num_queries`                                    | 查询次数。                                |
-| `num_query_errors_leader_changes`                | 因查询错误而导致的 Leader 变更的次数。      |
+| `num_query_errors_leader_changes`                | 因 Leader 变更而导致的查询错误的次数。      |
 | `num_query_errors`                               | 查询错误次数。                            |
 | `num_reclaimed_expired_sessions`                 | 服务端主动回收的过期的会话数量。          |
 | `num_rpc_sent_to_metad_failed`                   | Graphd 服务发给 Metad 的 RPC 请求失败的数量。          |
@@ -136,7 +136,7 @@
 | `query_latency_us`             | 查询延迟时间。                            |
 | `num_slow_queries`             | 慢查询次数。                              |
 | `num_query_errors`             | 查询报错语句数量。|
-| `num_query_errors_leader_changes` | 因查询错误而导致的 Leader 变更的次数。      |
+| `num_query_errors_leader_changes` | 因 Leader 变更而导致的查询错误的次数。      |
 | `num_killed_queries`           | 被终止的查询数量。                        |
 | `num_aggregate_executors`      | 聚合（Aggregate）算子执行时间。               |
 | `num_sort_executors`           | 排序（Sort）算子执行次数。                    |