docs: Update PROMETHEUS_LEGACY_NAME_VALIDATION_SCHEME description

Co-authored-by: Alan Clucas <[email protected]>
Signed-off-by: Eduardo Rodrigues <[email protected]>

Author: eduardodbr

docs/environment-variables.md

@@ -44,7 +44,7 @@ This document outlines environment variables that can be used to customize behav
 | `OFFLOAD_NODE_STATUS_TTL`                | `time.Duration`     | `5m`                                                                                        | The TTL to delete the offloaded node status. Currently only used for testing.                                                                                                                                                                                            |
 | `OPERATION_DURATION_METRIC_BUCKET_COUNT` | `int`               | `6`                                                                                         | The number of buckets to collect the metric for the operation duration.                                                                                                                                                                                                  |
 | `POD_NAMES`                              | `string`            | `v2`                                                                                        | Whether to have pod names contain the template name (v2) or be the node id (v1) - should be set the same for Argo Server.                                                                                                                                                |
-| `PROMETHEUS_LEGACY_NAME_VALIDATION_SCHEME`                              | `bool`            | `false`                                                                                        | Sets Prometheus NameValidationScheme to LegacyValidation instead of the default UTF8Validation.  |
+| `PROMETHEUS_LEGACY_NAME_VALIDATION_SCHEME`                              | `bool`            | `false`                                                                                        | Makes prometheus emit metrics with only underscores as delimiters by setting `NameValidationScheme` to `LegacyValidation`.   |
 | `RECENTLY_STARTED_POD_DURATION`          | `time.Duration`     | `10s`                                                                                       | The duration of a pod before the pod is considered to be recently started.                                                                                                                                                                                               |
 | `RECENTLY_DELETED_POD_DURATION`          | `time.Duration`     | `2m`                                                                                       | The duration of a pod before the pod is considered to be recently deleted.                                                                                                                                                                                                |
 | `TASK_RESULT_TIMEOUT_DURATION`           | `time.Duration`     | `10m`                                                                                       | The duration of time before a node is marked completed but the `taskresult` has not arrived yet, this is a more general and more conservative version of `RECENTLY_DELETED_POD_DURATION` that is used when a `taskresult` hasn't arrived but the pod is still around.    |