fix titles

Author: tac0turtle

.vitepress/config.ts

@@ -209,14 +209,14 @@ function sidebarHome() {
           text: "Technical Specifications",
           collapsed: true,
           items: [
-            { text: "overview", link: "/learn/specs/overview" },
-            { text: "block-manager", link: "/learn/specs/block-manager" },
-            { text: "block-validity", link: "/learn/specs/block-validity" },
-            { text: "da", link: "/learn/specs/da" },
-            { text: "full_node", link: "/learn/specs/full_node" },
-            { text: "header-sync", link: "/learn/specs/header-sync" },
-            { text: "p2p", link: "/learn/specs/p2p" },
-            { text: "store", link: "/learn/specs/store" },
+            { text: "Overview", link: "/learn/specs/overview" },
+            { text: "Block Manager", link: "/learn/specs/block-manager" },
+            { text: "Block Validity", link: "/learn/specs/block-validity" },
+            { text: "Data Availability", link: "/learn/specs/da" },
+            { text: "Full Node", link: "/learn/specs/full_node" },
+            { text: "Header Sync", link: "/learn/specs/header-sync" },
+            { text: "P2P", link: "/learn/specs/p2p" },
+            { text: "Store", link: "/learn/specs/store" },
           ],
         },
       ],