fix: Add missing safedb.path op-node config option

Author: pauldowman

pages/builders/node-operators/configuration/consensus-config.mdx

@@ -723,6 +723,16 @@ RPC listening port. Default is `9545`.
   <Tabs.Tab>`OP_NODE_RPC_PORT=9545`</Tabs.Tab>
 </Tabs>
 
+### safedb.path
+
+File path used to persist safe head update data. Disabled if not set.
+
+<Tabs items={['Syntax', 'Example', 'Environment Variable']}>
+  <Tabs.Tab>`--safedb.path=<value>`</Tabs.Tab>
+  <Tabs.Tab>`--safedb.path=/db`</Tabs.Tab>
+  <Tabs.Tab>`SAFEDB_PATH=/db`</Tabs.Tab>
+</Tabs>
+
 ### sequencer.enabled
 
 Enable sequencing of new L2 blocks. A separate batch submitter has to be deployed to publish the data for verifiers. Default is `false`.