Merge pull request #7430 from adamdmharvey/update-plugin-desc

chore(docs): Update plugin descriptions

microsite/data/plugins/git-release-manager.yaml

@@ -3,7 +3,7 @@ title: GitHub Release Manager
 author: '@Spotify'
 authorUrl: https://github.com/spotify
 category: Release management
-description: Manage releases without having to juggle git commands
+description: Manage releases without having to juggle git commands.
 documentation: https://github.com/backstage/backstage/tree/master/plugins/git-release-manager
 iconUrl: img/git-release-manager-logo.svg
 npmPackageName: '@backstage/plugin-git-release-manager'

microsite/data/plugins/gke-usage.yaml

@@ -3,7 +3,7 @@ title: GKE Usage
 author: BESTSELLER
 authorUrl: bestsellerit.com
 category: Discovery
-description: This plugin will show you the cost and resource usage of your application within GKE.
+description: This plugin will show you the cost and resource usage of your application within Google Kubernetes Engine (GKE).
 documentation: https://github.com/BESTSELLER/backstage-plugin-gkeusage/blob/master/README.md
 iconUrl: https://bestsellerit.com/img/google-container-engine_avatar.svg
 npmPackageName: '@bestsellerit/backstage-plugin-gkeusage'

microsite/data/plugins/harbor.yaml

@@ -3,7 +3,7 @@ title: Harbor
 author: BESTSELLER
 authorUrl: bestsellerit.com
 category: Discovery
-description: This plugin will show you information about docker images within harbor.
+description: This plugin will show you information about Docker images within the Harbor cloud native registry.
 documentation: https://github.com/BESTSELLER/backstage-plugin-harbor/blob/master/README.md
 iconUrl: https://bestsellerit.com/img/terraform-harbor/goharbor.jpeg
 npmPackageName: '@bestsellerit/backstage-plugin-harbor'