Update ch05-01-subroutine.md

Author: Euler-37

src/ch05-01-subroutine.md

@@ -45,7 +45,7 @@ program main
   end do
   !调用子程序
   call print_matrix(a)
-  b=0.0
+  b=1.5
   call axpy(2.0,a,b)
   write(*,*)"--------------------"
   call print_matrix(b)
@@ -58,10 +58,10 @@ $ fpm run
    4.00000000       5.00000000       6.00000000       7.00000000    
    5.00000000       6.00000000       7.00000000       8.00000000    
  --------------------
-   4.00000000       6.00000000       8.00000000       10.0000000    
-   6.00000000       8.00000000       10.0000000       12.0000000    
-   8.00000000       10.0000000       12.0000000       14.0000000    
-   10.0000000       12.0000000       14.0000000       16.0000000 
+   5.50000000       7.50000000       9.50000000       11.5000000    
+   7.50000000       9.50000000       11.5000000       13.5000000    
+   9.50000000       11.5000000       13.5000000       15.5000000    
+   11.5000000       13.5000000       15.5000000       17.5000000 
 ```