x86/PCI: Make a kernel-doc comment a normal one

The comment is using kernel-doc markup but that comment isn't a
kernel-doc comment so make it a normal one to avoid:

  arch/x86/pci/i386.c:373: warning: Function parameter or member \
	  'pcibios_assign_resources' not described in 'fs_initcall'

 [ bp: Massage and fixup comment while at it. ]
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1605257895-5536-5-git-send-email-alex.shi@linux.alibaba.com

arch/x86/pci/i386.c

@@ -366,9 +366,9 @@ static int __init pcibios_assign_resources(void)
 	return 0;
 }
 
-/**
- * called in fs_initcall (one below subsys_initcall),
- * give a chance for motherboard reserve resources
+/*
+ * This is an fs_initcall (one below subsys_initcall) in order to reserve
+ * resources properly.
  */
 fs_initcall(pcibios_assign_resources);