arch/x86/c_start.S: Remove duplicated "the" in comments

Change-Id: Ib1be1db6f475ad0e1f34703bfe1257d02b86742c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60067
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/arch/x86/c_start.S

@@ -4,7 +4,7 @@
 #include <cpu/x86/post_code.h>
 #include <arch/ram_segs.h>
 
-/* Place the stack in the bss section. It's not necessary to define it in the
+/* Place the stack in the bss section. It's not necessary to define it in
  * the linker script. */
 	.section .bss, "aw", @nobits
 .global _stack