Docs: Fix broken links to play (#71112)

* fix broken links to play

* Update docs/sources/dashboards/variables/_index.md

Co-authored-by: lwandz13 <126723338+lwandz13@users.noreply.github.com>

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Co-authored-by: lwandz13 <126723338+lwandz13@users.noreply.github.com>
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@ -45,18 +45,14 @@ To see variable settings, navigate to **Dashboard Settings > Variables**. Click
Variables can be used in titles, descriptions, text panels, and queries. Queries with text that starts with `$` are templates. Not all panels will have template queries.
The following dashboards in Grafana Play provide examples of template variables.
The following dashboards in Grafana Play provide examples of template variables:
- [Elasticsearch Metrics](https://play.grafana.org/d/z8OZC66nk/elasticsearch-8-2-0-sample-flight-data?orgId=1) - Uses ad hoc filters, global variables, and a custom variable.
- [Graphite Templated Nested](https://play.grafana.org/d/000000056/graphite-templated-nested?orgId=1) - Uses query variables, chained query variables, an interval variable, and a repeated panel.
- [Influx DB Group By Variable](https://play.grafana.org/d/000000137/influxdb-group-by-variable?orgId=1) - Query variable, panel uses the variable results to group the metric data.
- [InfluxDB Raw Query Template Var](https://play.grafana.org/d/000000083/influxdb-raw-query-template-var?orgId=1) - Uses query variables, chained query variables, and an interval variable.
- [InfluxDB Server Monitoring](https://play.grafana.org/d/AAy9r_bmk/influxdb-server-monitoring?orgId=1) - Uses query variables, chained query variables, an interval variable, and an ad hoc filter.
- [Prometheus templating](https://play.grafana.org/d/000000063/prometheus-templating?orgId=1) - Uses chained query variables.
- [Template Redux](https://play.grafana.org/d/p-k6QtkGz/template-redux?orgId=1) - Uses query variables, chained query variables, ad hoc filters, an interval variable, a text box variable, a custom variable, and a data source variable.
- [Graphite Templated Nested](https://play.grafana.org/d/000000056/templated-dynamic-dashboard?orgId=1&var-app=backend&var-server=backend_01&var-server=backend_02&var-server=backend_03&var-server=backend_04&var-interval=1h) - Uses query variables, chained query variables, an interval variable, and a repeated panel.
- [Global variables and interpolation](https://play.grafana.org/d/HYaGDGIMk/templating-global-variables-and-interpolation?orgId=1&var-Server=A%27A%22A&var-Server=BB%5CB)
- [Elasticsearch Dummy Flight Data](https://play.grafana.org/d/z8OZC66nk/elasticsearch-8-2-0-sample-flight-data?orgId=1&var-Filters=Carrier%7C%3D%7CLogstash%20Airways&var-query0=) - Uses ad hoc filters.
- [Templating, repeated panels](https://play.grafana.org/d/000000025/templating-repeated-panels?orgId=1) - Two sets of repeated panels use query variables.
- [Templating showcase](https://play.grafana.org/d/000000091/templating-showcase?orgId=1) - Uses custom, query, chained query, and data source variables.
- [Templating value groups](https://play.grafana.org/d/000000024/templating-value-groups?orgId=1) - Uses query variable with value groups.
- [Template Redux](https://play.grafana.org/d/p-k6QtkGz/template-redux?orgId=1) - Uses query variables, chained query variables, an interval variable, a text box variable, a custom variable, and a data source variable.
- [Nested Variables Drilldown](https://play.grafana.org/d/testdata-nested-variables-drilldown/templating-nested-variables-drilldown?orgId=1&var-datacenter=A&var-server=AA&var-server=AC&var-pod=All)
## Variable best practices