docs(react): remove reference to deleted examples in route-trees.md

[leeluca]

This PR removes a sentence referring to route tree examples that no longer exist in the route-trees.md file. (page link)
(Relates to #2249)

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• nx run-many --target=build --exclude=examples/**

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@tanstack/history

pnpm add https://pkg.pr.new/@tanstack/history@2250

@tanstack/react-cross-context

pnpm add https://pkg.pr.new/@tanstack/react-cross-context@2250

@tanstack/react-router

pnpm add https://pkg.pr.new/@tanstack/react-router@2250

@tanstack/react-router-with-query

pnpm add https://pkg.pr.new/@tanstack/react-router-with-query@2250

@tanstack/router-arktype-adapter

pnpm add https://pkg.pr.new/@tanstack/router-arktype-adapter@2250

@tanstack/router-cli

pnpm add https://pkg.pr.new/@tanstack/router-cli@2250

@tanstack/router-devtools

pnpm add https://pkg.pr.new/@tanstack/router-devtools@2250

@tanstack/router-generator

pnpm add https://pkg.pr.new/@tanstack/router-generator@2250

@tanstack/router-plugin

pnpm add https://pkg.pr.new/@tanstack/router-plugin@2250

@tanstack/router-valibot-adapter

pnpm add https://pkg.pr.new/@tanstack/router-valibot-adapter@2250

@tanstack/router-vite-plugin

pnpm add https://pkg.pr.new/@tanstack/router-vite-plugin@2250

@tanstack/router-zod-adapter

pnpm add https://pkg.pr.new/@tanstack/router-zod-adapter@2250

@tanstack/start

pnpm add https://pkg.pr.new/@tanstack/start@2250

@tanstack/start-vite-plugin

pnpm add https://pkg.pr.new/@tanstack/start-vite-plugin@2250

commit: 0c58172