misc: update remaining memory references to IEC standard

This commit brings the few remaining occurances
of kB, etc. into line with the IEC binary naming
standard.

Comments containing any such references have been
left unchanged.

Reference(s):
commit 2fc3f15770

Signed-off-by: Jim Warner <james.warner@comcast.net>

vmstat.c

@@ -783,7 +783,7 @@ int main(int argc, char *argv[])
 			default:
 				xerrx(EXIT_FAILURE,
 				     /* Translation Hint: do not change argument characters */
-				     _("-S requires k, K, m or M (default is kb)"));
+				     _("-S requires k, K, m or M (default is KiB)"));
 			}
 			szDataUnit[0] = optarg[0];
 			break;