Fix documentation on testing server application

Signed-off-by: Andrey Litvitski <[email protected]>

Author: therepanic

spring-grpc-docs/src/main/antora/modules/ROOT/pages/server.adoc

@@ -162,7 +162,7 @@ A `GrpcExceptionHandler` can be used to handle exceptions of a specific type, re
 
 If you include `spring-grpc-test` in your project, your gRPC server in a `@SpringBootTest` will be started in-process (i.e. not listening on a network port).
 All clients that connect to any server via the autoconfigured `GrpcChannelFactory` will be able to connect to it.
-You can switch the in-process server off by setting `spring.grpc.in-process.enabled` to `false`.
+You can switch the in-process server off by setting `spring.grpc.inprocess.enabled` to `false`.
 
 == Security