Add OpenSLR Sinhala spelling-correction dataset (train + eval)

README.md

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+---
+dataset_info:
+  features:
+  - name: dyslexic_sentence
+    dtype: string
+  - name: clean_sentence
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 21155146
+    num_examples: 60417
+  - name: eval
+    num_bytes: 2642852
+    num_examples: 7676
+  download_size: 10995150
+  dataset_size: 23797998
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: eval
+    path: data/eval-*
+---

data/eval-00000-of-00001.parquet

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+size 1240649

data/train-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:64686a590a5f3c11f98c47b1a108150497df78572f66f24e152f6e9605508cf8
+size 9754501