Docs: change headings on 2 data source pages for SEO (#73792)

* changed grafana alerting titles and headings

* changed H1 heading for SEO

docs/sources/alerting/fundamentals/data-source-alerting.md

@@ -6,11 +6,11 @@ labels:
     - cloud
     - enterprise
     - oss
-title: Data sources for Alerting
+title: Data sources and Grafana Alerting
 weight: 100
 ---
 
-# Data sources for Alerting
+# Data sources and Grafana Alerting
 
 There are a number of data sources that are compatible with Grafana Alerting. Each data source is supported by a plugin. You can use one of the built-in data sources listed below, use [external data source plugins](/grafana/plugins/?type=datasource), or create your own data source plugin.
 

docs/sources/datasources/_index.md

@@ -12,7 +12,7 @@ title: Data sources
 weight: 60
 ---
 
-# Data sources
+# Grafana data sources
 
 Grafana comes with built-in support for many _data sources_.
 If you need other data sources, you can also install one of the many data source plugins.