include/linux/damon.h: fix kernel-doc comments for 'damon_callback'

A few Kernel-doc comments in 'damon.h' are broken.  This fixes them.

Link: https://lkml.kernel.org/r/20210917123958.3819-5-sj@kernel.orgSigned-off-by: NSeongJae Park <sjpark@amazon.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/damon.h

@@ -62,7 +62,7 @@ struct damon_target {
 struct damon_ctx;
 
 /**
- * struct damon_primitive	Monitoring primitives for given use cases.
+ * struct damon_primitive - Monitoring primitives for given use cases.
  *
  * @init:			Initialize primitive-internal data structures.
  * @update:			Update primitive-internal data structures.
@@ -108,8 +108,8 @@ struct damon_primitive {
 	void (*cleanup)(struct damon_ctx *context);
 };
 
-/*
- * struct damon_callback	Monitoring events notification callbacks.
+/**
+ * struct damon_callback - Monitoring events notification callbacks.
  *
  * @before_start:	Called before starting the monitoring.
  * @after_sampling:	Called after each sampling.