correct comment about type of method in a LineInfoNode

[KristofferC]

The type is set here:

julia/src/jltypes.c

Lines 2802 to 2805 in 5304baa

	jl_new_datatype(jl_symbol("LineInfoNode"), core, jl_any_type, jl_emptysvec,
	jl_perm_symsvec(5, "module", "method", "file", "line", "inlined_at"),
	jl_svec(5, jl_module_type, jl_any_type, jl_symbol_type, jl_int32_type, jl_int32_type),
	jl_emptysvec, 0, 0, 5);

so it is ::Any.

And

julia/base/stacktraces.jl

Line 132 in 5304baa

elseif line.method isa Method || line.method isa Symbol

julia/base/stacktraces.jl

Line 129 in 5304baa

if line.method isa MethodInstance

shows it can at least be a Method and a MethodInstance.