* doc/emacs/cmdargs.texi (Colors X): Explain that tty color
support is dynamic.
* doc/lispref/frames.texi (Font and Color Parameters): Explain
that 'tty-color-mode' can be changed on the fly.
* doc/misc/efaq.texi (Colors on a TTY): Explain how to disable
'tty-color-mode', either at startup or dynamically.
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