fix links

Author: renejeglinsky

guides/providing-services.md

@@ -155,14 +155,14 @@ service AdminService {
 
 ## Generic Providers
 
-The CAP runtimes for [Node.js](../node.js) and [Java](../java) provide a wealth of generic implementations, which serve most requests automatically, with out-of-the-box solutions to recurring tasks such as search, pagination, or input validation — the majority of this guide focuses on these generic features.
+The CAP runtimes for [Node.js](../node.js/) and [Java](../java/) provide a wealth of generic implementations, which serve most requests automatically, with out-of-the-box solutions to recurring tasks such as search, pagination, or input validation — the majority of this guide focuses on these generic features.
 
 In effect, a service definition [as introduced above](#service-definitions) is all we need to run a full-fledged server out of the box. The need for coding reduces to real custom logic specific to a project's domain → section [Custom Logic](#custom-logic) picks that up.
 
 
 ### Serving CRUD Requests {#serving-crud}
 
-The CAP runtimes for [Node.js](../node.js) and [Java](../java) provide generic handlers, which automatically serve all CRUD requests to entities for CDS-modelled services on top of a default [primary database](databases).
+The CAP runtimes for [Node.js](../node.js/) and [Java](../java/) provide generic handlers, which automatically serve all CRUD requests to entities for CDS-modelled services on top of a default [primary database](databases).
 
 This comprises read and write operations like that: