- Improved wording in a few places for clarity
- Various capitalization/grammar fixes
- Change references to Neovim as 'editor' to 'Nvim'
- Be consistent regarding utilization of vim's documentation features,
e.g. unnamedclip -> |unnamedclip|
- Reflowed all changed paragraphs accordingly
- Add spaces before parentheses
- Remove trailing whitespace
- Standardize single spaces after periods. Vim's docs use two for the
most part, but Nvim's use one mainly, so just follow Nvim's conventions
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