[Fix] Data type in docstring in several Datasets

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #739 (09a1795) into master (2ce1578) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #739      +/-   ##
==========================================
- Coverage   82.95%   82.93%   -0.02%     
==========================================
  Files         215      215              
  Lines       12121    12121              
  Branches     1945     1945              
==========================================
- Hits        10055    10053       -2     
- Misses       1762     1763       +1     
- Partials      304      305       +1     

Flag	Coverage Δ
unittests	82.92% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmedit/datasets/sr_annotation_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_facial_landmark_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_folder_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_folder_gt_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_folder_multiple_gt_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_folder_ref_dataset.py	89.18% <ø> (ø)
mmedit/datasets/sr_folder_video_dataset.py	98.55% <ø> (ø)
mmedit/datasets/sr_lmdb_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_reds_dataset.py	100.00% <ø> (ø)
mmedit/datasets/sr_reds_multiple_gt_dataset.py	100.00% <ø> (ø)
... and 6 more

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