fixing file name

Author: MScalopez

…tabase-postgresql/8-explore-graphrag.yml …abase-postgresql/8-explore-graph-rag.ymllearn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/8-explore-graphrag.yml renamed to learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/8-explore-graph-rag.yml learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/8-explore-graphrag.yml renamed to learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/8-explore-graph-rag.yml

@@ -10,4 +10,4 @@ metadata:
   ms.topic: unit
 durationInMinutes: 5
 content: |
-  [!include[](includes/8-explore-graphrag.md)]
+  [!include[](includes/8-explore-graph-rag.md)]

…gresql/9-exercise-implement-graphrag.yml …resql/9-exercise-implement-graph-rag.ymllearn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/9-exercise-implement-graphrag.yml renamed to learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/9-exercise-implement-graph-rag.yml learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/9-exercise-implement-graphrag.yml renamed to learn-pr/wwl-data-ai/build-rag-applications-azure-database-postgresql/9-exercise-implement-graph-rag.yml

@@ -10,4 +10,4 @@ metadata:
   ms.topic: unit
 durationInMinutes: 30
 content: |
-  [!include[](includes/9-exercise-implement-graphrag.md)]
+  [!include[](includes/9-exercise-implement-graph-rag.md)]