fix an arch/alpha/Kconfig typo

Signed-off-by: NAdrian Bunk <bunk@stusta.de>

arch/alpha/Kconfig

@@ -534,7 +534,7 @@ config ARCH_DISCONTIGMEM_ENABLE
 	bool "Discontiguous Memory Support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL
 	help
-	  Say Y to upport efficient handling of discontiguous physical memory,
+	  Say Y to support efficient handling of discontiguous physical memory,
 	  for architectures which are either NUMA (Non-Uniform Memory Access)
 	  or have huge holes in the physical address space for other reasons.
 	  See <file:Documentation/vm/numa> for more.