doc: force line breaks where needed
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@ -43,8 +43,8 @@ If the attribute doesn’t exist, return *value* if provided, otherwise abort ev
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An attribute path is a dot-separated list of attribute names.
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An attribute name can be an identifier or a string.
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> *attrpath* = *name* [ `.` *name* ]...
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> *name* = *identifier* | *string*
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> *attrpath* = *name* [ `.` *name* ]... \
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> *name* = *identifier* | *string* \
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> *identifier* ~ `[a-zA-Z_][a-zA-Z0-9_'-]*`
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[Attribute selection]: #attribute-selection
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