fixed index files

Author: dvranes1

learn-pr/azure-databases/postgresql/basic-sql-aggregate-functions-grouping/index.yml

@@ -1,5 +1,5 @@
 ### YamlMime:Module
-uid: learn.azure-database.postgresql.basic-sql-aggregate-functions-grouping
+uid: learn.azure-databases.postgresql.basic-sql-aggregate-functions-grouping
 metadata:
   title: "Summarizing data: Aggregate functions and grouping"
   description: "Analyze data in PostgreSQL with aggregate functions and grouping. Learn COUNT, SUM, AVG, and filter results using GROUP BY and HAVING."

learn-pr/azure-databases/postgresql/basic-sql-join-tables/index.yml

@@ -1,5 +1,5 @@
 ### YamlMime:Module
-uid: learn.azure-database.postgresql.basic-sql-join-tables
+uid: learn.azure-databases.postgresql.basic-sql-join-tables
 metadata:
   title: "Combining data from multiple tables: SQL Joins Explained"
   description: "Combine data across multiple PostgreSQL tables using SQL JOINs. Learn INNER, LEFT, RIGHT, FULL OUTER, and NATURAL joins with real examples."

learn-pr/azure-databases/postgresql/basic-sql-limit-offset-order-by/index.yml

@@ -1,5 +1,5 @@
 ### YamlMime:Module
-uid: learn.azure-database.postgresql.basic-sql-limit-offset-order-by
+uid: learn.azure-databases.postgresql.basic-sql-limit-offset-order-by
 metadata:
   title: "Organizing data: Using LIMIT, OFFSET, and ORDER BY clauses"
   description: "Learn to control the size and order of query results in PostgreSQL with the LIMIT, OFFSET, and ORDER BY clauses. Master pagination, sorting, and optimizing performance with these essential SQL tools."