Update README.md

Author: davidjarzebowski

docs/README.md

@@ -6,7 +6,7 @@
   - **[GitHub Enterprise Server version requirements](requirements.md#github-enterprise-version-requirements)**
 - **[Getting started](getting-started.md)**
 - **[Using the backup and restore commands](usage.md)**
-- **[Scheduling backups](scheduling-backups.md)**
+- **[Scheduling backups & snapshot pruning](scheduling-backups.md)**
 - **[Backup snapshot file structure](backup-snapshot-file-structure.md)**
 - **[How does Backup Utilities differ from a High Availability replica?](faq.md)**
 - **[Docker](docker.md)**