mdoc fix: put the end-of-list macro after the last list element.

Approved by:   grog (mentor)

sys/boot/common/loader.8

@@ -493,12 +493,12 @@ Overrides the compile-time set value of
 .Va TCBHASHSIZE
 or the preset default of 512.
 Must be a power of 2.
-.El
 .It Va vm.kmem_size
 Sets the size of kernel memory (bytes).
 This overrides the value determined when the kernel was compiled.
 Modifies
 .Va VM_KMEM_SIZE .
+.El
 .Ss BUILTIN PARSER
 When a builtin command is executed, the rest of the line is taken
 by it as arguments, and it is processed by a special parser which