Update broken aliases (#29603)

docs/sources/developers/_index.md

 +++
 title = "Developers"
-aliases = ["/docs/plugins/developing/"]
+aliases = ["/docs/grafana/latest/plugins/developing/"]
 weight = 190
 +++
 

docs/sources/plugins/installation.md

 +++
 title = "Install plugins"
-aliases = ["/docs/plugins/installation/"]
+aliases = ["/docs/grafana/latest/plugins/installation/"]
 weight = 1
 +++
 

docs/sources/plugins/plugin-signatures.md

 +++
 title = "Plugin signatures"
 type = "docs"
-aliases = ["/docs/plugins/plugin-signature-verification"]
+aliases = ["/docs/grafana/latest/plugins/plugin-signature-verification"]
 +++
 
 # Plugin signatures