chore(docs): close group definitions

This would cause the structures' fields to appear as variable inside
Doxygen's result, and make it quite unreadable.

include/kernel/arch/i686/interrupts.h

@@ -175,3 +175,5 @@ static ALWAYS_INLINE bool interrupts_test_and_disable(void)
 }
 
 #endif /* KERNEL_I686_INTERRUPTS_H */
+
+/** @} */

include/kernel/mmu.h

@@ -108,3 +108,5 @@ void mmu_identity_map(paddr_t start, paddr_t end, int prot);
 paddr_t mmu_find_physical(vaddr_t);
 
 #endif /* KERNEL_MMU_H */
+
+/** @} */

include/kernel/process.h

@@ -59,6 +59,7 @@ typedef struct process {
     /** Information relative to the current state of the process */
     union {
 
+        /** For running processes only */
         struct {
             /** End of the currently running process's timeslice */
             timestamp_t preempt;

include/kernel/spinlock.h

@@ -30,3 +30,5 @@ static ALWAYS_INLINE void spinlock_release(spinlock_t *lock)
 {
     __atomic_clear(&lock->locked, __ATOMIC_RELEASE);
 }
+
+/** @} */

include/kernel/symbols.h

@@ -67,3 +67,5 @@ ALWAYS_INLINE const char *kernel_symbol_name(const kernel_symbol_t *sym)
 const kernel_symbol_t *kernel_symbol_from_address(u32 address);
 
 #endif /* KERNEL_SYMBOLS_H */
+
+/** @} */

kernel/memory/pmm.c

@@ -179,6 +179,8 @@ static bool pmm_initialize_bitmap(struct multiboot_info *mbt)
     return true;
 }
 
+/** @} */
+
 bool pmm_init(struct multiboot_info *mbt)
 {
     log_info("PMM", "Initializing pageframe allocator");

lib/libalgo/include/libalgo/libalgo.h

@@ -9,7 +9,8 @@
  * Libalgo is my own implementation of different datastructures and algorithms
  * used by the kernel.
  *
- * They are not necessarily optimized, nor well design, but at least they exist.
+ * They are not necessarily optimized, nor well design, but they have the merit
+ * to they exist.
  *
  */
 

lib/libalgo/include/libalgo/linked_list.h

@@ -152,3 +152,5 @@ static inline void llist_insert_sorted(llist_t *head, node_t *new,
 
     __llist_add(head, prev, new);
 }
+
+/** @} */

lib/libalgo/include/libalgo/queue.h

@@ -61,3 +61,5 @@ static ALWAYS_INLINE const node_t *queue_peek(const queue_t *queue)
 {
     return queue->head;
 }
+
+/** @} */