docs: fix links

docs/index.rst

@@ -35,17 +35,20 @@ SDK
 Extensions
 ----------
 
+Replay Protection
+~~~~~~~~~~~~~~~~~
+
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 1
 
    x/replay-protection.rst
 
 
-Staking Module
---------------
+Staking
+~~~~~~~
 
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 1
 
    staking/intro.rst
    staking/key-management.rst

docs/staking/intro.rst

@@ -47,7 +47,7 @@ that you've setup or joined a testnet.
 Generating Keys
 ---------------
 
-Review the `key management tutorial <../sdk/key-management.html>`__ and create one key
+Review the `key management tutorial <../key-management.html>`__ and create one key
 if you'll be joining the public testnet, and three keys if you'll be trying out a local
 testnet.
 

docs/staking/public-testnet.rst

@@ -9,7 +9,7 @@ other testnets, choose different initialization files, described below.
 Get Tokens
 ----------
 
-If you haven't already `created a key <../sdk/key-management.html>`__,
+If you haven't already `created a key <../key-management.html>`__,
 do so now. Copy your key's address and enter it into
 `this utility <http://www.cosmosvalidators.com/>`__ which will send you
 some ``fermion`` testnet tokens.