fix: typos in documentation files (#1683)

Corrected `reffered` to `referred`

Signed-off-by: FT <140458077+zeevick10@users.noreply.github.com>

Author: zeevick10

vscode/README.md

@@ -24,7 +24,7 @@ Please see the [extension documentation](https://solang.readthedocs.io/en/latest
 
 ## References
 
-Files solidity.configuration.json, syntaxes/solidity.json reffered from https://github.com/juanfranblanco/vscode-solidity
+Files solidity.configuration.json, syntaxes/solidity.json referred from https://github.com/juanfranblanco/vscode-solidity
 
 Commit hash: e22c566909a18ae646cbc41ea3e788222c8377a6