[SIEM] Update UI advanced settings text

[benskelker]

In Kibana > Advanced Settings, the SIEM UI strings should be clearer:

Suggested text (please feel free to suggest other improvements):

• Anomaly threshold
  Value above which machine learning job anomalies are displayed in the SIEM app.
  Valid values: 0 to 100.

• Elasticsearch indices
  Comma-delimited list of Elasticsearch indices from which the SIEM app collects events.

• Time filter refresh interval
  Default refresh interval for the SIEM time filter, in milliseconds.

• Time filter period
  Default period of time in the SIEM time filter.

[elasticmachine]

Pinging @elastic/siem

[benskelker]

For consistency with Kibana settings, changed to time picker.

[KOTungseth]

@benskelker we have an open issue in the Kibana repo to change these settings to time filter. Could we update this issue to match?

[benskelker]

Sure, thanks. Changed to time filter to be consistent with #47051.