Update README.md

README.md

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 # Portuguese T5 (aka "PTT5")
 
 ## Introduction
-PTT5 is a T5 model pretrained in the BrWac corpus, a large  collection  of  web  pages in Portuguese. It emproves T5's performance on Portuguese sentence similarity and entailment tasks. It's available in three sizes (small, base and large) and two vocabularies (Google's T5 original and ours, trained on Portuguese Wikipedia).
+PTT5 is a T5 model pretrained in the BrWac corpus, a large  collection  of  web  pages in Portuguese, improving T5's performance on Portuguese sentence similarity and entailment tasks. It's available in three sizes (small, base and large) and two vocabularies (Google's T5 original and ours, trained on Portuguese Wikipedia).
 
 For further information or requests, please go to [PTT5 repository](https://github.com/unicamp-dl/PTT5).