Convert TOML front matter to YAML (#49724)

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/developers/plugins/backend/_index.md

@@ -1,8 +1,15 @@
-+++
-title = "Backend plugins"
-keywords = ["grafana", "plugins", "backend", "plugin", "backend-plugins", "documentation"]
-aliases = ["/docs/grafana/latest/plugins/developing/backend-plugins-guide/"]
-+++
+---
+aliases:
+  - /docs/grafana/latest/plugins/developing/backend-plugins-guide/
+keywords:
+  - grafana
+  - plugins
+  - backend
+  - plugin
+  - backend-plugins
+  - documentation
+title: Backend plugins
+---
 
 # Backend plugins
 

docs/sources/developers/plugins/backend/grafana-plugin-sdk-for-go.md

@@ -1,7 +1,14 @@
-+++
-title = "Grafana Plugin SDK for Go"
-keywords = ["grafana", "plugins", "backend", "plugin", "backend-plugins", "sdk", "documentation"]
-+++
+---
+keywords:
+  - grafana
+  - plugins
+  - backend
+  - plugin
+  - backend-plugins
+  - sdk
+  - documentation
+title: Grafana Plugin SDK for Go
+---
 
 # Grafana plugin SDK for Go
 

docs/sources/developers/plugins/backend/plugin-protocol.md

@@ -1,7 +1,13 @@
-+++
-title = "Plugin protocol"
-keywords = ["grafana", "plugins", "backend", "plugin", "backend-plugins", "documentation"]
-+++
+---
+keywords:
+  - grafana
+  - plugins
+  - backend
+  - plugin
+  - backend-plugins
+  - documentation
+title: Plugin protocol
+---
 
 # Plugin protocol