DOCSP-49013 Fixed build error and toctree

Author: mballard-mdb

source/index.txt

@@ -25,7 +25,6 @@
    Run a Command </run-command>
    Monitoring </monitoring>
    Security </security>
-   In-Use Encryption </security/encrypt-fields>
    Compatibility </compatibility>
    Validate Driver Signatures </validate-signatures>
    What's New </whats-new>

source/security/authentication.txt

@@ -87,7 +87,7 @@ mechanism:
          :end-before: end-default-mongo-cred
          :dedent:
 
-You can also explicitly specify the `SCRAM-SHA-256`` authentication mechanism,
+You can also explicitly specify the ``SCRAM-SHA-256`` authentication mechanism,
 as shown in the following code snippets.
 
 Select the :guilabel:`Connection String` or the :guilabel:`MongoCredential`