cxl: Fix kernel-doc warnings

After Jonathan noticed [1] that 'struct cxl_dev_state' had a kernel-doc
entry without a corresponding struct attribute I ran the kernel-doc
script to see what else might be broken. Fix these warnings:

drivers/cxl/cxlmem.h:199: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * Event Interrupt Policy
drivers/cxl/cxlmem.h:224: warning: Function parameter or member 'buf' not described in 'cxl_event_state'
drivers/cxl/cxlmem.h:224: warning: Function parameter or member 'log_lock' not described in 'cxl_event_state'

Note that scripts/kernel-doc only finds missing kernel-doc entries. It
does not warn on too many kernel-doc entries, i.e. it did not catch the
fact that @info refers to a not present member.

Link: http://lore.kernel.org/r/20230606121054.000069e1@Huawei.com [1]
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/168679259170.3436160.3686460404739136336.stgit@dwillia2-xfh.jf.intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/cxlmem.h

@@ -195,7 +195,7 @@ static inline int cxl_mbox_cmd_rc2errno(struct cxl_mbox_cmd *mbox_cmd)
  */
 #define CXL_CAPACITY_MULTIPLIER SZ_256M
 
-/**
+/*
  * Event Interrupt Policy
  *
  * CXL rev 3.0 section 8.2.9.2.4; Table 8-52
@@ -215,8 +215,8 @@ struct cxl_event_interrupt_policy {
 /**
  * struct cxl_event_state - Event log driver state
  *
- * @event_buf: Buffer to receive event data
- * @event_log_lock: Serialize event_buf and log use
+ * @buf: Buffer to receive event data
+ * @log_lock: Serialize event_buf and log use
  */
 struct cxl_event_state {
 	struct cxl_get_event_payload *buf;