demo: fix comment in pyhon raft demo

[vjuranek]

• fix comment which breaks syntax highlingthing in some editors (e.g. Emacs)
• remove unsued variable from log() function

[aphyr]

Thank you! Sorry about the delay, I've been absolutely swamped with work and some personal stuff this last few weeks.

[vjuranek]

Thank you! Sorry about the delay, I've been absolutely swamped with work and some personal stuff this last few weeks.

Definitely no problem. Thanks for your great work!