Adapt SFG to field typing changes in pystencils

Adapt SFG to the introduction of dynamic field types in pystencils!443 (merged):

• Cannot create instances of std::span, std::vector, std::mdspan or sycl::accessor from dynamically-typed fields

docs/source/usage/examples/guide_generator_scripts/05/kernels.py

@@ -5,7 +5,7 @@ import sympy as sp
 
 with SourceFileGenerator() as sfg:
     #   Define a copy kernel
-    src, dst = ps.fields("src, dst: [1D]")
+    src, dst = ps.fields("src, dst: double[1D]")
     c = sp.Symbol("c")
 
     @ps.kernel
@@ -19,7 +19,7 @@ with SourceFileGenerator() as sfg:
     import pystencilssfg.lang.cpp.std as std
 
     sfg.include("<span>")
-    
+
     sfg.function("scale_kernel")(
         sfg.map_field(src, std.vector.from_field(src)),
         sfg.map_field(dst, std.span.from_field(dst)),