Manpage sais color_free_*, but it's actually color_*_free

[Stefan Hagen]

Hi,

I noticed that the manpage describes:

• color_free_focus
• color_free_focus_maximized
• color_free_unfocus
• color_free_unfocus_maximized

However, the actual values are:

• color_focus_free
• color_focus_maximized_free
• color_unfocus_free
• color_unfocus_maximized_free

I can send a PR later if noone else is faster.