jiffies: Transform comment about time_* functions into DOC block

This general note about time_* functions is also useful to be available in
kernel documentation. Therefore transform it into a kernel-doc DOC block
with proper formatting.
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240123164702.55612-6-anna-maria@linutronix.de

include/linux/jiffies.h

@@ -102,12 +102,15 @@ static inline u64 get_jiffies_64(void)
 }
 #endif
 
-/*
- *	These inlines deal with timer wrapping correctly. You are
- *	strongly encouraged to use them:
- *	1. Because people otherwise forget
- *	2. Because if the timer wrap changes in future you won't have to
- *	   alter your driver code.
+/**
+ * DOC: General information about time_* inlines
+ *
+ * These inlines deal with timer wrapping correctly. You are strongly encouraged
+ * to use them:
+ *
+ * #. Because people otherwise forget
+ * #. Because if the timer wrap changes in future you won't have to alter your
+ *    driver code.
  */
 
 /**