drm/amd/display/dc/bios/bios_parser2: Fix some formatting issues and missing parameter docs

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:501: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:501: warning: Function parameter or member 'gpio_id' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:501: warning: Function parameter or member 'info' not described in 'bios_parser_get_gpio_pin_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:815: warning: Function parameter or member 'dcb' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:815: warning: Function parameter or member 'signal' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:815: warning: Function parameter or member 'index' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:815: warning: Function parameter or member 'ss_info' not described in 'bios_parser_get_spread_spectrum_info'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:1210: warning: Function parameter or member 'dcb' not described in 'bios_parser_set_scratch_critical_state'
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser2.c:1210: warning: Function parameter or member 'state' not described in 'bios_parser_set_scratch_critical_state'

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c

@@ -485,10 +485,11 @@ static struct atom_hpd_int_record *get_hpd_record(
  * bios_parser_get_gpio_pin_info
  * Get GpioPin information of input gpio id
  *
- * @param gpio_id, GPIO ID
- * @param info, GpioPin information structure
- * @return Bios parser result code
- * @note
+ * @dcb:     pointer to the DC BIOS
+ * @gpio_id: GPIO ID
+ * @info:    GpioPin information structure
+ * return: Bios parser result code
+ * note:
  *  to get the GPIO PIN INFO, we need:
  *  1. get the GPIO_ID from other object table, see GetHPDInfo()
  *  2. in DATA_TABLE.GPIO_Pin_LUT, search all records,
@@ -801,11 +802,11 @@ static enum bp_result get_ss_info_v4_2(
  * ver 3.1,
  * there is only one entry for each signal /ss id.  However, there is
  * no planning of supporting multiple spread Sprectum entry for EverGreen
- * @param [in] this
- * @param [in] signal, ASSignalType to be converted to info index
- * @param [in] index, number of entries that match the converted info index
- * @param [out] ss_info, sprectrum information structure,
- * @return Bios parser result code
+ * @dcb:     pointer to the DC BIOS
+ * @signal:  ASSignalType to be converted to info index
+ * @index:   number of entries that match the converted info index
+ * @ss_info: sprectrum information structure,
+ * return: Bios parser result code
  */
 static enum bp_result bios_parser_get_spread_spectrum_info(
 	struct dc_bios *dcb,
@@ -1196,13 +1197,11 @@ static bool bios_parser_is_accelerated_mode(
 }
 
 /**
- * bios_parser_set_scratch_critical_state
+ * bios_parser_set_scratch_critical_state - update critical state bit
+ *                                          in VBIOS scratch register
  *
- * @brief
- *  update critical state bit in VBIOS scratch register
- *
- * @param
- *  bool - to set or reset state
+ * @dcb:   pointer to the DC BIO
+ * @state: set or reset state
  */
 static void bios_parser_set_scratch_critical_state(
 	struct dc_bios *dcb,