Update docs/en/client/configuration.md
Update docs/en/client/configuration.md

Co-authored-by: ST-DDT <8a9e7df5bb00b245bc94561482bd669f98781036@gmx.de>
yidongnan/grpc-spring-boot-starter,yidongnan/grpc-spring-boot-starter,yidongnan/grpc-spring-boot-starter