docs: upd what's new in v5.2

[skip ci]

docs/sources/guides/whats-new-in-v5-2.md

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 Grafana v5.2 brings new features, many enhancements and bug fixes. This article will detail the major new features and enhancements.
 
 * [Elasticsearch alerting]({{< relref "#elasticsearch-alerting" >}}) it's finally here!
-* [Native builds for ARM]({{< relref "#native-builds-for-armv" >}}) native builds of Grafana for many more platforms!
+* [Native builds for ARM]({{< relref "#native-builds-for-arm" >}}) native builds of Grafana for many more platforms!
 * [Improved Docker image]({{< relref "#improved-docker-image" >}}) with support for docker secrets
 * [Security]({{< relref "#security" >}}) make your Grafana instance more secure
 * [Prometheus]({{< relref "#prometheus" >}}) with alignment enhancements