Fix duplicate header in install.md (#6596)

Removed duplicate section header for TLS and certificate verification options.

Author: garylfowler

content/influxdb3/explorer/install.md

@@ -349,7 +349,6 @@ To enable TLS/SSL for secure connections:
 > [!Note]
 > The nginx web server automatically detects and uses certificate files in the mounted path.
 
-#### TLS and certificate verification options
 #### TLS and certificate verification options
 
 Use the following environment variables to configure TLS and certificate verification: