fix download sample link

Fix links from PR #33908
on line 15. LInk will work once it merges.
Invalid file link: '~/security/authentication/configure-oidc-web-authentication/sample/oidc-net8'. | 15, 1


Cross reference not found: 'core/blazor/security/blazor-web-app-with-oidc'. 
line | 80, 5

Cross reference not found: 'sblazor/security/blazor-web-app-oidc'.	309, 1