doc: fix doxygen error in hypercall.h
Doxygen API comment added to hypercall.h was incorrect causing the doc
build process to fail with a warning (parameter not documented).
Fixes:
@@ -194,7 +194,7 @@ int32_t hcall_pulse_irqline(struct vm *vm, uint16_t vmid, uint64_t param);
*
* @param vm Pointer to VM data structure
* @param vmid ID of the VM
- * @irq_req: request command for IRQ set or clear
+ * @param ops request command for IRQ set or clear
*
* @pre Pointer vm shall point to VM0
* @return 0 on success, non-zero on error.
