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the manpage of 'echo' command lists --help and --version, which is wrong. The GNU info page of 'echo' specifically says that '--' is treated just like any other character. So manpage should be updated to reflect this change.
The man page is for coreutils, while you're probably using your shell builtin echo. To get the coreutils version use `env echo`. Better again is to use printf rather than echo as the latter is non portable and awkward in many regards. Also to get help for the shell echo, use `help echo`. I understand the new version of bash will output this automatically output the equivalent of `help $builtin` with `$builtin --help`, though I expect echo may be different in this regard