docs: `View::render_to_string` panic #1483

Job	Run time
get-leptos-changed / Detect Source Change	5s
CI (integrations/actix) / Run ci (nightly)	1m 23s
CI (integrations/utils) / Run ci (nightly)	1m 31s
CI (integrations/axum) / Run ci (nightly)	1m 22s
CI (integrations/viz) / Run ci (nightly)	1m 21s
CI (leptos) / Run ci (nightly)	3m 5s
CI (leptos_config) / Run ci (nightly)	1m 25s
CI (leptos_dom) / Run ci (nightly)	3m 7s
CI (leptos_hot_reload) / Run ci (nightly)	1m 30s
CI (leptos_macro) / Run ci (nightly)	1m 26s
CI (leptos_reactive) / Run ci (nightly)	1m 22s
CI (leptos_server) / Run ci (nightly)	1m 31s
CI (meta) / Run ci (nightly)	1m 31s
CI (router) / Run ci (nightly)	1m 32s
CI (server_fn) / Run ci (nightly)	1m 29s
CI (server_fn_macro) / Run ci (nightly)	1m 29s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	1m 23s
	26m 32s

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