Update sidenav entries to use consistent casing

sites/docs/src/content/ai/best-practices/structure-output.md

@@ -2,8 +2,8 @@
 title: Structure & output
 sidenav: ai
 description: >
-  Learn how to use structured input and output schemas to receive reliable, 
-  parsable JSON data from an LLM.
+  Learn how to use structured input and output schemas to
+  receive reliable, parsable JSON data from an LLM.
 prev:
   title: Prompting
   path: /ai/best-practices/prompting

sites/docs/src/content/ai/evals.md

@@ -1,9 +1,9 @@
 ---
-title: AI Evaluations
+title: AI evaluations
 sidenav: ai
 description: >
-  Learn about Dart and Flutter's evaluation frameworks for measuring AI tooling
-  reliability.
+  Learn about Dart and Flutter's evaluation frameworks for
+  measuring AI tooling reliability.
 ---
 
 :::experimental

sites/docs/src/data/sidenav/ai.yml

@@ -21,7 +21,7 @@
           permalink: /ai/antigravity-cli
     - title: Developer experience
       permalink: /ai/best-practices/developer-experience
-    - title: "AI Evaluations (experimental)"
+    - title: "AI evaluations (experimental)"
       permalink: /ai/evals
 
 - title: Build AI-powered apps
@@ -55,7 +55,7 @@
           permalink: /ai/ai-toolkit/custom-llm-providers
         - title: Chat client sample
           permalink: /ai/ai-toolkit/chat-client-sample
-    - title: AI Best Practices
+    - title: AI best practices
       permalink: /ai/best-practices
       children:
         - title: Overview