fix: annotation tag in documentation (#654)

# Description

Annotation in this page is different than
[here](https://retina.sh/docs/metrics/annotations/) and it does not work
correctly.

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- [ ] I have tested the changes locally.
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- [ ] I have updated the documentation, if necessary.
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## Additional Notes

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---

Please refer to the [CONTRIBUTING.md](../CONTRIBUTING.md) file for more
information on how to contribute to this project.

Signed-off-by: Alex Castilio dos Santos <alexsantos@microsoft.com>

docs/02-Installation/03-Config.md

@@ -9,7 +9,7 @@ Defaults are specified for each component in *deploy/legacy/manifests/controller
 
 * `enablePodLevel`: When this toggle is set to true, Retina will gather Advanced/Pod-Level metrics. Advanced metrics can attach Pod metadata to Retina's metrics.
 * `remoteContext`: When this toggle is set to true, retina will watch Pods on the cluster.
-* `enableAnnotations`: When this toggle is set to true, retina will gather metrics for the annotated resources. Namespaces or Pods can be annotated with `retina.sh/v1alpha=observe`. The operator and enableRetinaEndpoint for the operator should be enabled.
+* `enableAnnotations`: When this toggle is set to true, retina will gather metrics for the annotated resources. Namespaces or Pods can be annotated with `retina.sh=observe`. The operator and enableRetinaEndpoint for the operator should be enabled.
 * `enabledPlugin_linux`: Array of enabled plugins for linux.
 * `enabledPlugin_win`: Array of enabled plugins for windows.
 * `metricsInterval`: the interval for which metrics will be gathered (in seconds). (@deprecated, use metricsIntervalDuration instead)