"Filling" text means breaking it up into lines that fit a specified
width. Emacs does filling in two ways. In Auto Fill mode, inserting
text with self-inserting characters also automatically fills it. There
are also explicit fill commands that you can use when editing text
leaves it unfilled. When you edit formatted text, you can specify a
style of filling for each portion of the text ( Formatted Text).
* Auto Fill Auto Fill mode breaks long lines automatically.
* Fill Commands Commands to refill paragraphs and center lines.
* Fill Prefix Filling paragraphs that are indented
or in a comment, etc.
* Adaptive Fill How Emacs can determine the fill prefix automatically.
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