Update introspection.rst (#2606)
Update introspection.rst (#2606)

Was referring to scope secrets. Reused sentence from https://github.com/IdentityServer/IdentityServer4/blob/release/docs/topics/reference_tokens.rst
IdentityServer/IdentityServer4,IdentityServer/IdentityServer4,MienDev/IdentityServer4,MienDev/IdentityServer4,MienDev/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,IdentityServer/IdentityServer4