Fix typos in scrapy/commands/setting.py

[berkerpeksag]

[Cherry-picked from https://github.com/scrapy/scrapy/compare/scrapy:master...berkerpeksag:python3]

• intepreted -> interpreted
• "a list" instead of "an float" in --getlist help
• "an float"-> "a float"

Also, backslashes were redundant. So I removed them.

[curita]

Thanks for the corrections! Looks like scrapy settings needed some attention, --getdict is missing as an option and it's probably better to print the repr() of those settings, you can't tell the type of the printed value if you use --get for example. I'll be merging this pr now, those suggested changes can be implemented later.

[berkerpeksag]

Good idea, will open a new PR for your suggestions. Thanks! Also, I noticed that --set is a global option, but --get* options are only usable with the settings command. Is this intentional?

[curita]

I think yes, you should be able to override settings while running any command, but there isn't much usefulness to get them while doing something else, that's probably why --get* options are in a command of their own.