2) the same section - a typo - "This server will host your application once is is built."
3) typo - "4.1.2. With Maven)"
5) typo - section "4.6. Add commands to your plugin" - "in which case a the plugin..."
6) section "4.6." contains wrong link "described in detail" which points again to the top of the Seam Documentation

7) section "4.6.3" - there are outputs for executed commands combining --named and ordered option parameters. The outputs are the following:
$ example-plugin --one cat --two dog bird lizard
>> option one equals: cat
>> option two equals: dog
>> option one equals: bird
>> option two equals: lizard

I think it is wrong and it should be:

$ example-plugin --one cat --two dog bird lizard
>> option one equals: cat
>> option two equals: dog
>> option three equals: bird
>> option four equals: lizard

Note that there are two such snippets.