Fix docstring of dabbrev-abbrev-char-regexp
* lisp/dabbrev.el (dabbrev-abbrev-char-regexp): Using a value of nil is equivalent to "\\sw\\|\\s_", and has no special behavior. If the previous character doesn't match, we search backwards for one that does, not throw an error. Replace Lisp example with C based one to make it clear that "symbol" means a sequence of word and symbol constituent characters, not a Lisp symbol (Bug#358).
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