Docs: Fixed broken links in Basic Concepts (#21035)

* Fixed broken links

* Update basic_concepts.md

* Fix REF_NOT_FOUND errors

* add shortcode

Co-authored-by: Robby Milo <robbymilo@gmail.com>

docs/sources/features/datasources/_index.md

@@ -38,4 +38,4 @@ The following data sources are officially supported:
 
 
 ## Data source plugins
 ## Data source plugins
 
 
-Since grafana 3.0 you can install data sources as plugins. Check out [Grafana.net](https://grafana.com/plugins) for more data sources.
+Since Grafana 3.0 you can install data sources as plugins. Check out [Grafana.net](https://grafana.com/plugins) for more data sources.

docs/sources/installation/debian.md

@@ -15,7 +15,7 @@ weight = 200
 
 
 This page explains how to install Grafana dependencies, download and install Grafana, get the service up and running on your system, and the package details.
 This page explains how to install Grafana dependencies, download and install Grafana, get the service up and running on your system, and the package details.
 
 
-**Note on upgrading:** While the process for upgrading Grafana is very similar to installing Grafana, there are some key backup steps you should perform. Read [Upgrading Grafana]({{< relref "installation/upgrading.md" >}}) for tips and guidance on updating an existing installation.
+**Note on upgrading:** While the process for upgrading Grafana is very similar to installing Grafana, there are some key backup steps you should perform. Read [Upgrading Grafana]({{< relref "upgrading.md" >}}) for tips and guidance on updating an existing installation.
 
 
 ## 1. Download and install
 ## 1. Download and install