feat(replay): Add note about min replay duration (#15168)

Adds note about min replay duration for replay vs error sampling.

Author: billyvg

docs/platforms/javascript/common/session-replay/configuration.mdx

@@ -39,7 +39,7 @@ The following can be configured as integration options in `replayIntegration({})
 | stickySession            | `boolean`                           | `true`      | Keeps track of a user regardless of a page refresh. Note that closing a tab ends a session, so a single user using multiple tabs will be recorded as multiple sessions.      |
 | mutationLimit            | `number `                           | 10000       | The upper bound of mutations to process before Session Replay stops recording due to performance impacts. See [Mutation Limits](#mutation-limits)                            |
 | mutationBreadcrumbLimit  | `number `                           | 750         | The upper bound of mutations to process before Session Replay sends a breadcrumb to warn of large mutations. See [Mutation Limits](#mutation-limits)                         |
-| minReplayDuration        | `number`                            | 5000        | The length of the replay, **in milliseconds**, before the SDK should start sending to Sentry. Max value is 15000.                                                            |
+| minReplayDuration        | `number`                            | 5000        | The length of the replay, **in milliseconds**, before the SDK should start sending to Sentry. Max value is 15000. **Note:** This only applies to session-based sampling (`replaysSessionSampleRate`). For error/buffer-based sampling (`replaysOnErrorSampleRate`), replays are captured immediately when an error is sampled. |
 | maxReplayDuration        | `number`                            | 3600000        | The maximum length of the replay, **in milliseconds**, that the SDK should send to Sentry. Max value is 3600000 (1 hour).                                                            |
 | workerUrl                | `string`                            | `undefined` | A URL for a self-hosted worker for compression Replay data. See [Using a Custom Compression Worker](#using-a-custom-compression-worker) to learn more.                       |
 | networkDetailAllowUrls   | <code>(string\|RegExp)[]</code>     | `[]`        | Capture request and response details for XHR and fetch requests that match the given URLs.                                                                                   |