docs: remove gitignore suggestion for generated route tree file (#6025)

docs: remove gitignore suggestion for generated routing files in start docs

Author: Yavnik

docs/start/framework/react/guide/routing.md

@@ -147,8 +147,6 @@ src/
 
 This file is automatically generated when you run TanStack Start (via `npm run dev` or `npm run start`). This file contains the generated route tree and a handful of TS utilities that make TanStack Start's type-safety extremely fast and fully inferred.
 
-**You may gitignore this file, since it is a build artifact.**
-
 ## Nested Routing
 
 TanStack Router uses nested routing to match the URL with the correct component tree to render.

docs/start/framework/solid/guide/routing.md

@@ -143,8 +143,6 @@ src/
 
 This file is automatically generated when you run TanStack Start (via `npm run dev` or `npm run start`). This file contains the generated route tree and a handful of TS utilities that make TanStack Start's type-safety extremely fast and fully inferred.
 
-**You may gitignore this file, since it is a build artifact.**
-
 ## Nested Routing
 
 TanStack Router uses nested routing to match the URL with the correct component tree to render.