src/data: update some doc link names

src/data/documentation-links.yaml

@@ -22,7 +22,7 @@
       to: /docs/fundamentals/sync-modes
     - id: Account management
       to: /docs/fundamentals/account-management
-    - id: Backup restore
+    - id: 'Backup & Restore'
       to: /docs/fundamentals/backup-restore
     - id: Logs
       to: /docs/fundamentals/logs
@@ -142,7 +142,7 @@
           to: /docs/tools/clef/clique-signing
     - id: puppeth
       to: /docs/tools/puppeth
-    - id: Abigen
+    - id: abigen
       to: /docs/tools/abigen
     - id: devp2p
       to: /docs/tools/devp2p