plurar for requirements

On-behalf-of: Gergely Brautigam <gergely.brautigam@sap.com>

Signed-off-by: Gergely Brautigam <182850+Skarlso@users.noreply.github.com>

Author: Skarlso

content/docs/concepts/plugin-system.md

@@ -26,7 +26,7 @@ perspective, once a plugin is installed, its features are available transparentl
 additional configuration is required beyond installation.
 
 This does not mean that configuration cannot be provided! Plugins can have their own
-configuration requirements that is provided to them through the ocmconfig configuration
+configuration requirements that are provided to them through the `ocmconfig` configuration
 file using a specific `type`. For example:
 
 ```yaml