mm/page_alloc: fix documentation error

When I increased the upper bound of the min_free_kbytes value in
ee8eb9a ("mm/page_alloc: increase default min_free_kbytes bound") I
forgot to tweak the above comment to reflect the new value.  This patch
fixes that mistake.

Signed-off-by: Joel Savitz <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Rafael Aquini <[email protected]>
Cc: Fabrizio D'Angelo <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

Author: theyoyojo

mm/page_alloc.c

@@ -7832,7 +7832,7 @@ void setup_per_zone_wmarks(void)
  * Initialise min_free_kbytes.
  *
  * For small machines we want it small (128k min).  For large machines
- * we want it large (64MB max).  But it is not linear, because network
+ * we want it large (256MB max).  But it is not linear, because network
  * bandwidth does not increase linearly with machine size.  We use
  *
  *	min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: