Fix sample usage for --format argument (#36009)
Fix sample usage for --format argument (#36009)

The argument `--key-format` was changed to `--format` in #23803, but the sample usage wasn't updated.

Fixes #36008
aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore