Update datasets.md (#404)

fix typo

docs/datasets.md

@@ -64,7 +64,7 @@ This dataset is proposed for exploring the relationship of prompts and high-qual
 Moreover, this dataset is divided into two subsets: original and upscale.
 This dataset is proposed for enabling research on text-to-image model prompting.
 
-### upsplash-lite
+### Unsplash-lite
 
 The [Unsplash-lite](https://github.com/unsplash/datasets) Dataset comprises 25k nature-themed Unsplash photos, 25k keywords, and 1M searches.
 This dataset covers a vast range of uses and contexts. Its extensive scope in intent and semantics opens new avenues for research and learning.