(Fixit): Favor C-/ keybinding for undo throughout. Link to Erasing
node. (Undo): Reorganize paragraphs for logical flow. Move keybinding rationale to a footnote. (Kill Errors): Remove node, due to redundancy with Erasing. (Spelling): Move discussion of flyspell to end. Note new behavior of M-$ in active region. Remove non-ispell-specific keybindings from table.
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