Karma: fix quoting in README.md and one mistake.

* plugins.karma.allowunaddressedkarma doesn't mean that the bot must be addressed by nick. It must be addressed, but that can also happen with prefix.

[SKIP CI]
Lart: fix README.md.

[SKIP CI]
Later: fix topics and quoting in README.md.

Also updated to reflect our default settings.

[SKIP CI]
Limiter: fix quoting in README.md.
MoobotFactoids: fix quoting in README.md.

[SKIP CI]
NickAuth: fix quoting and wording in README.md.

[SKIP CI]
Nickometer: fix quoting in README.md.

[SKIP CI]
Praise: fix quoting in README.md.

[SKIP CI]
RSS: fix quoting & mention onetoone in README.md.

[SKIP CI]
Relay: fix quoting & mention cmdall in README.md

[SKIP CI]
Scheduler: fix quoting & add plugins in README.md.

[SKIP CI]