message: Fix typo
  Part of
diff: @@ -4,7 +4,7 @@ Chevrotain allows users to customize both the parser and lexer error messages.
  This can be accomplished by implementing the following interfaces:
  - [IParserErrorMessageProvider](https://sap.github.io/chevrotain/documentation/4_3_0/interfaces/iparsererrormessageprovider.html)
  -- [IParserErrorMessageProvider](https://sap.github.io/chevrotain/documentation/4_3_0/interfaces/ilexererrormessageprovider.html)
  +- [ILexerErrorMessageProvider](https://sap.github.io/chevrotain/documentation/4_3_0/interfaces/ilexererrormessageprovider.html)
  See executable examples:
  