docs: fixed typos in docs

docs/install/migrate-repos.rst

@@ -20,6 +20,6 2. Use docker named volume ``rc_reposvol
     repositories should be adjusted since |RCE| reads the content of them.
 
 .. note::
-    Theres another override file for dev setup, which mounts default workspace folder as a repo storage by default.
-    you can configure this by ``changing docker-compose-apps.dev.yaml``
+    There's another override file for dev setup, which mounts default workspace folder as a repo storage by default.
+    you can configure this by changing ``docker-compose-apps.dev.yaml``
     (and commenting out all lines ``$WORKSPACE_HOME:/var/opt/rhodecode_repo_store:delegated``)