fixed custom provider markdown link

Author: Scrip7

content/microservices/basics.md

@@ -238,7 +238,7 @@ constructor(
 
 > info **Hint** The `ClientsModule` and `ClientProxy` classes are imported from the `@nestjs/microservices` package.
 
-At times we may need to fetch the transporter configuration from another service (say a `ConfigService`), rather than hard-coding it in our client application. To do this, we can register a [custom provider](/techniques/custom-providers) using the `ClientProxyFactory` class. This class has a static `create()` method, which accepts a transporter options object, and returns a customized `ClientProxy` instance.
+At times we may need to fetch the transporter configuration from another service (say a `ConfigService`), rather than hard-coding it in our client application. To do this, we can register a [custom provider](/fundamentals/custom-providers) using the `ClientProxyFactory` class. This class has a static `create()` method, which accepts a transporter options object, and returns a customized `ClientProxy` instance.
 
 ```typescript
 @Module({