[doc] fix fcos reader tab for ce test (#6969)

configs/fcos/_base_/fcos_reader.yml

 worker_num: 2
 TrainReader:
   sample_transforms:
-    - Decode: {}
-    - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
-    - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
-    - RandomFlip: {}
+  - Decode: {}
+  - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
+  - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
+  - RandomFlip: {}
   batch_transforms:
-    - Permute: {}
-    - PadBatch: {pad_to_stride: 128}
-    - Gt2FCOSTarget:
-        object_sizes_boundary: [64, 128, 256, 512]
-        center_sampling_radius: 1.5
-        downsample_ratios: [8, 16, 32, 64, 128]
-        norm_reg_targets: True
+  - Permute: {}
+  - PadBatch: {pad_to_stride: 128}
+  - Gt2FCOSTarget:
+      object_sizes_boundary: [64, 128, 256, 512]
+      center_sampling_radius: 1.5
+      downsample_ratios: [8, 16, 32, 64, 128]
+      norm_reg_targets: True
   batch_size: 2
   shuffle: True
   drop_last: True
@@ -20,22 +20,22 @@ TrainReader:
 
 EvalReader:
   sample_transforms:
-    - Decode: {}
-    - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
-    - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
-    - Permute: {}
+  - Decode: {}
+  - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
+  - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
+  - Permute: {}
   batch_transforms:
-    - PadBatch: {pad_to_stride: 128}
+  - PadBatch: {pad_to_stride: 128}
   batch_size: 1
 
 
 TestReader:
   sample_transforms:
-    - Decode: {}
-    - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
-    - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
-    - Permute: {}
+  - Decode: {}
+  - Resize: {target_size: [800, 1333], keep_ratio: True, interp: 1}
+  - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
+  - Permute: {}
   batch_transforms:
-    - PadBatch: {pad_to_stride: 128}
+  - PadBatch: {pad_to_stride: 128}
   batch_size: 1
   fuse_normalize: True

configs/fcos/fcos_r50_fpn_multiscale_2x_coco.yml

@@ -10,18 +10,18 @@ weights: output/fcos_r50_fpn_multiscale_2x_coco/model_final
 
 TrainReader:
   sample_transforms:
-    - Decode: {}
-    - RandomResize: {target_size: [[640, 1333], [672, 1333], [704, 1333], [736, 1333], [768, 1333], [800, 1333]], keep_ratio: True, interp: 1}
-    - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
-    - RandomFlip: {}
+  - Decode: {}
+  - RandomResize: {target_size: [[640, 1333], [672, 1333], [704, 1333], [736, 1333], [768, 1333], [800, 1333]], keep_ratio: True, interp: 1}
+  - NormalizeImage: {mean: [0.485, 0.456, 0.406], std: [0.229, 0.224, 0.225], is_scale: True}
+  - RandomFlip: {}
   batch_transforms:
-    - Permute: {}
-    - PadBatch: {pad_to_stride: 128}
-    - Gt2FCOSTarget:
-        object_sizes_boundary: [64, 128, 256, 512]
-        center_sampling_radius: 1.5
-        downsample_ratios: [8, 16, 32, 64, 128]
-        norm_reg_targets: True
+  - Permute: {}
+  - PadBatch: {pad_to_stride: 128}
+  - Gt2FCOSTarget:
+      object_sizes_boundary: [64, 128, 256, 512]
+      center_sampling_radius: 1.5
+      downsample_ratios: [8, 16, 32, 64, 128]
+      norm_reg_targets: True
   batch_size: 2
   shuffle: True
   drop_last: True