Explain LINKER_ERROR

fix aptos-labs#5663

developer-docs-site/docs/guides/handle-aptos-errors.md

@@ -70,7 +70,7 @@ Help us update this list by sending pull requests containing the errors you enco
 |RESOURCE_DOES_NOT_EXIST|We tried to access a resource that does not exist under the account.|
 |RESOURCE_ALREADY_EXISTS|We tried to create a resource under an account where that resource already exists.|
 |UNKNOWN_STATUS|A reserved status to represent an unknown vm status. This is std::u64::MAX, but we can't pattern match on that, so put the hardcoded value in.|
-|
+|LINKER_ERROR|The function that your command is executing is not a valid function. Double check your command.|
 |
 
 ## Move Standard Library (stdlib)