scripts: update the comments of kallsyms support

	# kallsyms support

	# Generate section listing all symbols and add it into vmlinux

	# It's a three step process:

	# 1)  Link .tmp_vmlinux1 so it has all symbols and sections,

	# 1)  Link .tmp_vmlinux.kallsyms1 so it has all symbols and sections,

	#     but __kallsyms is empty.

	#     Running kallsyms on that gives us .tmp_kallsyms1.o with

	#     the right size

	# 2)  Link .tmp_vmlinux2 so it now has a __kallsyms section of

	# 2)  Link .tmp_vmlinux.kallsyms2 so it now has a __kallsyms section of

	#     the right size, but due to the added section, some

	#     addresses have shifted.

	#     From here, we generate a correct .tmp_kallsyms2.o

	#     From here, we generate a correct .tmp_vmlinux.kallsyms2.o

	# 3)  That link may have expanded the kernel image enough that

	#     more linker branch stubs / trampolines had to be added, which

	#     introduces new names, which further expands kallsyms. Do another