drm/amdgpu: fix typo

Fix spelling mistake:
	"differnt" -> "different"
	"commond"  -> "common"
Signed-off-by: Rongguang Wei <weirongguang@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/atombios.h

@@ -4665,7 +4665,7 @@ typedef  struct _ATOM_EXTERNAL_DISPLAY_CONNECTION_INFO
   UCHAR                    Reserved[3];                           // for potential expansion
 }ATOM_EXTERNAL_DISPLAY_CONNECTION_INFO;
 
-//Related definitions, all records are differnt but they have a commond header
+//Related definitions, all records are different but they have a common header
 typedef struct _ATOM_COMMON_RECORD_HEADER
 {
   UCHAR               ucRecordType;                      //An emun to indicate the record type