Revise title and description for diagrams section

Updated the title and description for the diagrams guide.

Author: ajay-dhangar

docs/guides/markdown-features/markdown-features-diagrams.mdx

@@ -1,12 +1,11 @@
 ---
+title: Diagrams
 id: diagrams
 title: Diagrams
 description: Writing diagrams with Mermaid
 slug: /markdown-features/diagrams
 ---
 
-# Diagrams
-
 Visualize your ideas directly inside Markdown using **[Mermaid](https://mermaid-js.github.io/mermaid/)**. Mermaid lets you create flowcharts, sequence diagrams, class diagrams, and more, using a simple text syntax.
 
 <AdsComponent />
@@ -153,4 +152,4 @@ config:
 graph TD;
     A-->B;
     B-->C;
-```
+```