Update index.md

docs/index.md

@@ -6,7 +6,7 @@
 - [Published by Routledge](https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.routledge.com%2FLinear-Models-with-Python%2FFaraway%2Fp%2Fbook%2F9781138483958%3Futm_source%3Dauthor%26utm_medium%3Dshared_link%26utm_campaign%3DB043141_jm1_5ll_6rm_t081_1al_julianfarawayauthorshare&data=05%7C01%7Cjjf23%40bath.ac.uk%7C5229b0dc8d564222c10108db31fa6e3f%7C377e3d224ea1422db0ad8fcc89406b9e%7C0%7C0%7C638158723883874621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=4w0HrQW7Rur2%2BXVBkVExvvr5jdK60Qo3QEn0MYvUXqs%3D&reserved=0)
 - [Python scripts and data](https://github.com/julianfaraway/LMP) 
 - [Python package](https://pypi.org/project/faraway/)
-- [Errata](https://julianfaraway.github.io/LMP/docs/errata.md)
+- [Errata](https://julianfaraway.github.io/LMP/errata.md)
 
 ## Preface