Inserted missing space so that the ping-pong example works.

When pasting the ping snippet I got this error
nanocat --req --connect tcp://127.0.0.1:1234 --data ping--format ascii
nanocat: Unexpected argument ``ascii''

Inserting a spaces fixes this ascii error.
Fixed typo in description.
Fixed typo in description.
Fixed typos in description.
Fixed typos in description.
Merge pull request #240 from neoneye/master

Inserted missing space so that the ping-pong example works