(Left Margin Paren): Explain consequences of changing
open-paren-in-column-0-is-defun-start more concisely.
(Which Function, Program Indent, Info Lookup): Minor edits.
(Basic Indent): If region is active, TAB indents the region.
(Multi-line Indent): If region is active, TAB indents the region. Note
that indent-region is useful when Transient Mark mode is off.
(Matching): The delimiter at the cursor is highlighted---the character
changes color.
(Symbol Completion): Link to Completion node.
