fix number

examples/filters/shadow.c

@@ -22,7 +22,7 @@
  * NRPARTS*(NX/NPARTS+2*SHADOW) elements, partitioned in the traditionnal way,
  * thus showing how shadowing shows up.
  *
- * For instance, with NX=2, SHADOW=1, and NPARTS=4:
+ * For instance, with NX=8, SHADOW=1, and NPARTS=4:
  *
  * vector
  * x0 x1 x2 x3 x4 x5 x6 x7 x8 x9