Update gridcalculator.rst

Author: pcav

python/plugins/processing/algs/saga/help/gridcalculator.rst

@@ -53,7 +53,7 @@ Example
 
 You can for instance use the Grid Calculator module to flag 0 cells with -1:
 
-ifelse(eq(g1,0), (-1), g2)
+``ifelse(eq(g1,0), (-1), g2)``
 
 The formula reads like "if the cell is equal to zero, then write -1 else write the current value to the output grid".