Updated readme

Signed-off-by: AmbrishRamachandiran <ambrish.r@infosys.com>

.changeset/curvy-ladybugs-impress.md

@@ -2,4 +2,4 @@
 '@backstage/plugin-adr': patch
 ---
 
-Updated README document in adr plugin
+Updated README

docs/backend-system/building-backends/08-migrating.md

@@ -757,7 +757,7 @@ implementations that they represent, and being exported from there.
 
 ### The Auth Plugin
 
-A basic installation of the auth plugin with a microsoft provider will look as follows.
+A basic installation of the auth plugin with a Microsoft provider will look as follows.
 
 ```ts title="packages/backend/src/index.ts"
 const backend = createBackend();