Fix syntax error in rst

Co-authored-by: Felicity Chapman <felicitymay@github.com>

Author: aeisenberg

docs/codeql/codeql-cli/analyzing-databases-with-the-codeql-cli.rst

@@ -80,7 +80,7 @@ You can also specify:
 
 - .. include:: ../reusables/threads-query-execution.rst
 
-. pull-quote::
+.. pull-quote::
 
    Upgrading databases