serial: doc: Un-document obsolete tmpbuf_sem
uart_info.tmpbuf and uart_info.tmpbuf_sem were removed in v2.6.10, in full-history-linux commit a797ad7e3ae9cad4 ("[SERIAL] Clean up serial_core.c write functions."). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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