rename article and navigation node

Author: olena-stoliarova

articles/communication-services/concepts/identifiers.md

@@ -61,4 +61,4 @@ There are user identities that you create yourself and there are external identi
 * For an introduction to communication identities, see [Identity model](./identity-model.md).
 * To learn how to quickly create identities for testing, see the [quick-create identity quickstart](../quickstarts/identity/quick-create-identity.md).
 * To learn how to use Communication Services together with Microsoft Teams, see [Teams interoperability](./teams-interop.md).
-* To learn how to use a Raw ID, see [Raw ID use cases in Communication SDKs](./raw-id-use-cases.md).
+* To learn how to use a Raw ID, see [Use cases for string identifiers in Communication SDKs](./raw-id-use-cases.md).

articles/communication-services/concepts/raw-id-use-cases.md

@@ -1,5 +1,5 @@
 ---
-title: Azure Communication Services - Raw ID use cases
+title: Azure Communication Services - Use cases for string identifiers
 description: Learn how to use Raw ID in SDKs
 author: ostoliarova-msft
 manager: rajuanitha88
@@ -12,7 +12,7 @@ ms.service: azure-communication-services
 #Customer intent: As a developer, I want to learn how to correctly use Raw ID so that I can build applications that run efficiently.
 ---
 
-# Raw ID use cases in Communication SDKs
+# Use cases for string identifiers in Communication SDKs
 
 This article provides use cases for choosing a string (Raw ID) as a representation type of the [CommunicationIdentifier type](./identifiers.md#the-communicationidentifier-type) in Azure Communication Services SDKs. Following this guidance will help you understand some use cases when you might want to choose a Raw ID over the CommunicationIdentifier derived types.
 

articles/communication-services/toc.yml

@@ -161,7 +161,7 @@ items:
       href: concepts/identifiers.md
     - name: Credentials best practices
       href: concepts/credentials-best-practices.md
-    - name: Raw ID use cases
+    - name: Use cases for string identifiers
       href: concepts/raw-id-use-cases.md
   - name: Chat
     items: