Update index

doc/index.rst

@@ -6,4 +6,4 @@ Internal documentation
 3. `Generating Consensus Tests <generating_tests.rst>`_
 4. `Using snapshot sync <snapshot_sync.rst>`_
 5. `Creating a single-node private network and deploying a contract with Remix <private_net_remix.rst>`_
-6. `Creating a private network with 2 syncing nodes <private_net_sync.rst>`_
+6. `Creating a private network with two syncing nodes <private_net_sync.rst>`_