docs(bevy_render): Remove copy-pasted docstring #8479

This line does not appear to be an intended part of the Panics section, but instead looks like it was missed when copy-pasting a Panics section from above. It confused me when I was reading the docs. At first I read it as if it was an imperative statement saying not to use `match` statements which seemed odd and out of place. Once I saw the code it was clearly in err.