fix typos

README.md

@@ -12,12 +12,12 @@ Rageval is a tool that helps you evaluate RAG system. The evaluation consists of
 
 ## Definition of tasks and metrics
 ### 1. [The generate task](./rageval/tasks/_generate.py)
-The generate task is to answer the question based on the contexts provided by retrieval modules in RAG. Typically, the context could be extracted/generated text snippets from the compressor, or relevant documents from the re-ranker. Here, we divide the metrics used in the generate task into two categories, namely *answer correctness* and *answer groundedness*.
+The generate task is to answer the question based on the contexts provided by retrieval modules in RAG. Typically, the context could be extracted/generated text snippets from the compressor, or relevant documents from the re-ranker. Here, we divide metrics used in the generate task into two categories, namely *answer correctness* and *answer groundedness*.
 
 (1) **Answer Correctness**: this category of metrics is to evaluate the correctness by comparing the generated answer with the groundtruth answer. Here are some commonly used metrics:
 
-* [Answer NLI Correctness](./rageval/metrics/_answer_claim_recall.py): also know as *claim recall* in [the paper (Tianyu et al.)](https://arxiv.org/abs/2305.14627).
-* [Answer EM Correctness](./rageval/metrics/_answer_claim_recall.py): also know as *Exact Match* as used in [ASQA (Ivan Stelmakh et al.)](https://arxiv.org/abs/2204.06092).
+* [Answer NLI Correctness](./rageval/metrics/_answer_claim_recall.py): also known as *claim recall* in [the paper (Tianyu et al.)](https://arxiv.org/abs/2305.14627).
+* [Answer EM Correctness](./rageval/metrics/_answer_claim_recall.py): also known as *Exact Match* as used in the [ASQA paper (Ivan Stelmakh et al.)](https://arxiv.org/abs/2204.06092).
 
 (2) **Answer Groundedness**: this category of metrics is to evaluate the groundedness (also known as factual consistency) by comparing the generated answer with the provided contexts. Here are some commonly used metrics:
 * ~~answer_citation_precision ("answer_citation_precision")~~