Merge pull request #14688 from 0xminds/patch-2

docs: Fix incorrect Devcon year Update index.md

Author: corwintines

public/content/history/index.md

@@ -29,12 +29,12 @@ Since 2021, upgrades to the **execution layer** are named according to the city
 
 | Upgrade Name | Devcon Year | Devcon Number | Upgrade Date |
 | ------------ | ----------- | ------------- | ------------ |
-| Berlin       | 2015        | 0             | Apr 15, 2021 |
-| London       | 2016        | I             | Aug 5, 2021  |
-| Shanghai     | 2017        | II            | Apr 12, 2023 |
-| **Cancun**   | 2018        | III           | Mar 13, 2024 |
-| _Prague_     | 2019        | IV            | TBD          |
-| _Osaka_      | 2020        | V             | TBD          |
+| Berlin       | 2014        | 0             | Apr 15, 2021 |
+| London       | 2015        | I             | Aug 5, 2021  |
+| Shanghai     | 2016        | II            | Apr 12, 2023 |
+| **Cancun**   | 2017        | III           | Mar 13, 2024 |
+| _Prague_     | 2018        | IV            | TBD          |
+| _Osaka_      | 2019        | V             | TBD          |
 | _Bogota_     | 2022        | VI            | TBD          |
 | _Bangkok_    | 2024        | VII           | TBD          |