Remove export as an example of is_background actions/operations (#5058)

History/Workflow Export is not accounted for via the `is_background`
label on `temporal_cloud_v1_total_action_count` /
`temporal_cloud_v0_total_action_count`. Drop the misleading export
examples from the OpenMetrics (v1) and legacy (v0) metrics references.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: dustin-temporal

docs/cloud/metrics/openmetrics/metrics-reference.mdx

@@ -607,7 +607,7 @@ The total number of actions performed per second. Actions with `is_background=fa
 
 | Label | Description |
 | ----- | ----- |
-| `is_background` | Whether the action was background: `true` or `false`. Background actions (e.g. History export) do not count toward the action rate limit |
+| `is_background` | Whether the action was background: `true` or `false`. Background actions do not count toward the action rate limit |
 | `namespace_mode` | Indicates if actions are produced by an `active` or a `standby` Namespace |
 
 :::note

docs/cloud/metrics/reference.mdx

@@ -219,7 +219,7 @@ Use the following labels to filter metrics:
 | `temporal_account`         | Temporal Account.                                                                                                                                                                                                                                                                          |
 | `temporal_namespace`       | Temporal Namespace.                                                                                                                                                                                                                                                                        |
 | `temporal_service_type`    | Frontend or Matching or History or Worker.                                                                                                                                                                                                                                                 |
-| `is_background`            | This label on `temporal_cloud_v0_total_action_count` indicates when actions are produced by a Temporal background job, for example: hourly Workflow Export.                                                                                                                                |
+| `is_background`            | This label on `temporal_cloud_v0_total_action_count` indicates when actions are produced by a Temporal background job.                                                                                                                                |
 | `namespace_mode`           | This label on `temporal_cloud_v0_total_action_count` indicates if actions are produced by an active vs a standby Namespace. For a regular Namespace, `namespace_mode` will always be “active”.                                                                                             |
 
 The following is an example of how you can filter metrics using labels: