DOC: restore note about "independant" typo

The independant -> independent error was fixed in 801a0a35 ("DOC: fix
name for "option independant-streams"), but the note about the wrong
name was erroneously fixed in 0e82b92a ("DOC: fix a few config typos").

Restore the "wrong" name so that when reasearching this option people
can actually find it.

Could be backported to 1.8.
1 file changed