spi: pxa2xx: Drop the stale entry in documentation TOC

The documentation had been removed, so should TOC entry.

Reported-by: Stephen Rothwell <[email protected]>
Fixes: 2d069c1 ("spi: pxa2xx: Remove outdated documentation")
Signed-off-by: Andy Shevchenko <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: andy-shev

Documentation/spi/index.rst

@@ -10,7 +10,6 @@ Serial Peripheral Interface (SPI)
    spi-summary
    spidev
    butterfly
-   pxa2xx
    spi-lm70llp
    spi-sc18is602