Update 1_client_credentials.rst (#3486)
Update 1_client_credentials.rst (#3486)

Simply corrected the use of the word "uses" to "use".
IdentityServer/IdentityServer4,IdentityServer/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,MienDev/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,MienDev/IdentityServer4