Update skills_codebook.md

skills_taxonomy_v2/analysis/sentence_classifier/skills_codebook.md

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 We are using the European Commission's (ESCO) definition of [skills](https://ec.europa.eu/esco/portal/skill) for this project. The Commission states that skills can fall within **ANY of the four categories**: 1) knowledge; 2) skills; 3) attitudes and values and 4) langauge skills and knowledge. 
 
-A phrase or term that falls with **any** of the aforementioned categories should be considered a 'skill' and identified as such. There will be overlap with the ESCO skills, but we may also have some entirely new skills not in ESCO but otherwise fall within their four categories.
+A phrase or term that falls within **any** of the aforementioned categories should be considered a 'skill' and identified as such. There will be overlap with the ESCO skills, but we may also have some entirely new skills not in ESCO but otherwise fall within their four categories.
 
 ## Labelling Examples