docs(savanna): let database secret video use full content width

Remove the fixed width attribute so video sizing is controlled by the
theme videoblock styles.

Author: ngarakapati

modules/savanna/modules/administration/pages/settings/how2-create-database-secret.adoc

@@ -16,7 +16,7 @@ Treat database secrets like passwords. Do not commit them to source control.
 ====
 
 .Watch: create a database secret in Savanna
-video::Savanna_Database_Secrets.mp4[width=760]
+video::Savanna_Database_Secrets.mp4[]
 
 For secrets in Admin Portal or GraphStudio, see https://www.tigergraph.com/docs/gui/4.3/admin-portal/management/user-management/#manage-secrets[Manage secrets^] and https://www.tigergraph.com/docs/tigergraph-server/4.3/user-access/user-credentials/#_create_a_secret[Create a secret^].