README: Add FZF_TMUX_OPTS example for tmux popup

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Junegunn Choi 2023-01-19 13:25:08 +09:00
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@ -363,7 +363,7 @@ fish.
```
If you're on a tmux session, you can start fzf in a tmux split-pane or in
a tmux popup window by setting `FZF_TMUX_OPTS` (e.g. `-d 40%`).
a tmux popup window by setting `FZF_TMUX_OPTS` (e.g. `export FZF_TMUX_OPTS='-p80%,60%'`).
See `fzf-tmux --help` for available options.
More tips can be found on [the wiki page](https://github.com/junegunn/fzf/wiki/Configuring-shell-key-bindings).