Add changesets for plugin README updates

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

.changeset/docs-frontend-plugin-installation.md

@@ -0,0 +1,16 @@
+---
+'@backstage/plugin-api-docs': patch
+'@backstage/plugin-catalog': patch
+'@backstage/plugin-catalog-graph': patch
+'@backstage/plugin-catalog-import': patch
+'@backstage/plugin-catalog-unprocessed-entities': patch
+'@backstage/plugin-devtools': patch
+'@backstage/plugin-home': patch
+'@backstage/plugin-kubernetes': patch
+'@backstage/plugin-mui-to-bui': patch
+'@backstage/plugin-org': patch
+'@backstage/plugin-scaffolder': patch
+'@backstage/plugin-user-settings': patch
+---
+
+Updated installation documentation to use feature discovery as the default.