fix documentation bug.

[mattn]

I found a documentation bug that MUST be fixed.

[codecov-io]

Codecov Report

Merging #1905 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1905      +/-   ##
==========================================
+ Coverage   75.05%   75.11%   +0.06%     
==========================================
  Files          76       76              
  Lines      125303   125303              
==========================================
+ Hits        94045    94123      +78     
+ Misses      31258    31180      -78

Impacted Files	Coverage Δ
src/gui.c	45.58% <0%> (+0.05%)	⬆️
src/channel.c	83.73% <0%> (+0.13%)	⬆️
src/gui_gtk_x11.c	47.65% <0%> (+0.15%)	⬆️
src/libvterm/src/screen.c	74.62% <0%> (+0.15%)	⬆️
src/term.c	52.99% <0%> (+0.23%)	⬆️
src/message.c	68.35% <0%> (+0.25%)	⬆️
src/os_unix.c	57.38% <0%> (+0.28%)	⬆️
src/window.c	81.42% <0%> (+0.63%)	⬆️
src/version.c	80.3% <0%> (+1.01%)	⬆️
src/if_xcmdsrv.c	85.55% <0%> (+2.22%)	⬆️
... and 1 more

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[brammool]

Hmm, I would not completely delete that. And I like to keep the quote. I'll rephrase it.