libluna: Document Ignore.h and ImplPOSIX.cpp

libluna/include/luna/Ignore.h

@@ -1,5 +1,29 @@
+/**
+ * @file Ignore.h
+ * @author apio (cloudapio.eu)
+ * @brief Do nothing.
+ *
+ * @copyright Copyright (c) 2023, the Luna authors.
+ *
+ */
+
 #pragma once
 
+/**
+ * @brief Do nothing.
+ *
+ * Calling
+ *  ignore(a, b, c);
+ * is a more compact equivalent of doing:
+ *  (void)a;
+ *  (void)b;
+ *  (void)c;
+ *
+ * This function is used to discard unused variables avoiding compiler warnings, if you know they'll be used in the
+ * future.
+ *
+ * @tparam Args The list of ignored variable types.
+ */
 template <class... Args> constexpr void ignore(Args...)
 {
 }

libluna/src/ImplPOSIX.cpp

@@ -1,4 +1,11 @@
-/* POSIX userspace implementation of libluna hooks. */
+/**
+ * @file ImplPOSIX.cpp
+ * @author apio (cloudapio.eu)
+ * @brief POSIX userspace implementation of libluna hooks.
+ *
+ * @copyright Copyright (c) 2023, the Luna authors.
+ *
+ */
 
 #include <luna/Attributes.h>
 #include <luna/Result.h>