hwmon: prefix kernel-doc comments for structs with struct

The command ./scripts/kernel-doc -none include/linux/hwmon.h warns:

  include/linux/hwmon.h:406: warning: This comment starts with '/**', but
    isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
   * Channel information
  include/linux/hwmon.h:425: warning: This comment starts with '/**', but
    isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
   * Chip configuration

Address those kernel-doc warnings by prefixing kernel-doc descriptions for
structs with the keyword 'struct'.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20211216154257.26758-1-lukas.bulwahn@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

include/linux/hwmon.h

@@ -403,7 +403,7 @@ struct hwmon_ops {
 };
 
 /**
- * Channel information
+ * struct hwmon_channel_info - Channel information
  * @type:	Channel type.
  * @config:	Pointer to NULL-terminated list of channel parameters.
  *		Use for per-channel attributes.
@@ -422,7 +422,7 @@ struct hwmon_channel_info {
 	})
 
 /**
- * Chip configuration
+ * struct hwmon_chip_info - Chip configuration
  * @ops:	Pointer to hwmon operations.
  * @info:	Null-terminated list of channel information.
  */