message: fix typo in doc strings - env var egs
diff: @@ -452,7 +452,7 @@ pub struct MetricsSettings {
  ///
  /// **Environment variable**
  /// ```text
  - /// XAYNET_API__STORE_URL=http://localhost:8086
  + /// XAYNET_METRICS__STORE_URL=http://localhost:8086
  /// ```
  pub store_url: String,
  @@ -468,7 +468,7 @@ pub struct MetricsSettings {
  ///
  /// **Environment variable**
  /// ```text
  - /// XAYNET_API__STORE_NAME=test
  + /// XAYNET_METRICS__STORE_NAME=test
  /// ```
  pub store_name: String,
  }
  