Sentence case all example titles (#2889)

This PR converts all example titles and categories to sentence case, to
make them consistent with our UI and the other examples.

### Change Type

- [x] `documentation` — Changes to the documentation only[^2]

[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version

### Test Plan

1. Look at the examples app.
2. Check that all the titles of examples make you feel calm and good
inside.

- [ ] Unit Tests
- [ ] End to end tests

### Release Notes

- Docs: Made the examples titles sentence case.

apps/docs/scripts/functions/generateExamplesContent.ts

@@ -9,7 +9,7 @@ const section: InputSection = {
 	description: 'Code recipes for bending tldraw to your will.',
 	categories: [
 		{ id: 'basic', title: 'Getting Started', description: '', groups: [] },
-		{ id: 'ui', title: 'UI/Theming', description: '', groups: [] },
+		{ id: 'ui', title: 'UI & Theming', description: '', groups: [] },
 		{ id: 'shapes/tools', title: 'Shapes & Tools', description: '', groups: [] },
 		{ id: 'data/assets', title: 'Data & Assets', description: '', groups: [] },
 		{ id: 'editor-api', title: 'Editor API', description: '', groups: [] },

apps/examples/src/examples/api/README.md

@@ -1,5 +1,5 @@
 ---
-title: Controlling the Editor
+title: Controlling the editor
 component: ./APIExample.tsx
 category: editor-api
 priority: 1

apps/examples/src/examples/context-toolbar/README.md

@@ -1,5 +1,5 @@
 ---
-title: Context Toolbar
+title: Context toolbar
 component: ./ContextToolbar.tsx
 category: ui
 priority: 2

apps/examples/src/examples/editable-shape/README.md

@@ -1,5 +1,5 @@
 ---
-title: Editable Shape
+title: Editable shape
 component: ./EditableShapeExample.tsx
 category: shapes/tools
 priority: 1

apps/examples/src/examples/keyboard-shortcuts/README.md

@@ -1,5 +1,5 @@
 ---
-title: Keyboard Shortcuts
+title: Keyboard shortcuts
 component: ./KeyboardShortcuts.tsx
 category: ui
 priority: 2

apps/examples/src/examples/meta-on-change/README.md

@@ -1,5 +1,5 @@
 ---
-title: Shape Meta (on change)
+title: Shape meta (on change)
 component: ./OnChangeShapeMetaExample.tsx
 category: data/assets
 priority: 3

apps/examples/src/examples/meta-on-create/README.md

@@ -1,5 +1,5 @@
 ---
-title: Shape Meta (on create)
+title: Shape meta (on create)
 component: ./OnCreateShapeMetaExample.tsx
 category: data/assets
 priority: 3

apps/examples/src/examples/readonly/README.md

@@ -1,5 +1,5 @@
 ---
-title: Readonly
+title: Read-only
 component: ./ReadOnlyExample
 category: basic
 priority: 3

apps/examples/src/examples/ui-events/README.md

@@ -1,5 +1,5 @@
 ---
-title: Code X-Ray for UI events
+title: Code x-ray for UI events
 component: ./UiEventsExample.tsx
 category: editor-api
 priority: 0

apps/examples/src/examples/user-presence/README.md

@@ -1,5 +1,5 @@
 ---
-title: User Presence
+title: User presence
 component: ./UserPresenceExample.tsx
 category: collaboration
 priority: 2