Update docs/sql/SQL-joins/intro-sql-joins.md

Co-authored-by: Copilot <[email protected]>

Author: Adez017

docs/sql/SQL-joins/intro-sql-joins.md

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 description: In this tutorial, you will learn about SQL Joins, their importance, types of joins, when to use each join type, and how they work with relational databases.
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-## 
+## What are SQL Joins?
 
 SQL **Joins** are operations used to combine rows from two or more tables based on a related column between them. Joins are fundamental to relational databases as they allow you to retrieve data that is spread across multiple tables, following the principles of database normalization.