typo fixes: disadvantadge -> disadvantage

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

Documentation/arm/IXP4xx

@@ -85,7 +85,7 @@ IXP4xx provides two methods of accessing PCI memory space:
 2) If > 64MB of memory space is required, the IXP4xx can be 
    configured to use indirect registers to access PCI This allows 
    for up to 128MB (0x48000000 to 0x4fffffff) of memory on the bus. 
-   The disadvantadge of this is that every PCI access requires 
+   The disadvantage of this is that every PCI access requires 
    three local register accesses plus a spinlock, but in some 
    cases the performance hit is acceptable. In addition, you cannot 
    mmap() PCI devices in this case due to the indirect nature

include/asm-arm/arch-ixp4xx/io.h

@@ -38,7 +38,7 @@ extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
  * 2) If > 64MB of memory space is required, the IXP4xx can be configured
  *    to use indirect registers to access PCI (as we do below for I/O
  *    transactions). This allows for up to 128MB (0x48000000 to 0x4fffffff)
- *    of memory on the bus. The disadvantadge of this is that every 
+ *    of memory on the bus. The disadvantage of this is that every 
  *    PCI access requires three local register accesses plus a spinlock,
  *    but in some cases the performance hit is acceptable. In addition,
  *    you cannot mmap() PCI devices in this case.