CLtL error re function special form

[Steven Haflich <smh@mit-ems.ARPA>]

Surely this must have been noticed before, but on page 87:

	function fn				[Special Form]

	The value of function is always the functional interpretation
	of fn;  fn is interpreted as if it had appeared in the
	functional-position of a function invocation.  In particular,
	if fn is a symbol, the functional definition associated with
	that symbol is returned;  see symbol-function.  If fn is a
	lambda-expression ...

Unlike the function special form, symbol-function does not see lexical
function bindings.  The reference to symbol-function here was probably
intended just to convey the distinction between a symbol's `functional'
interpretation and it's `regular' i.e. symbol-value interpretation.
But it's wrong, and potentially misleading.

Fixing the text is awkward because lexical function binding special
forms are not presented until p.113.  But CLtL is more of a reference
than a teaching manual.  Perhaps the reference to symbol function
should just be deleted.

A similar but less bothersome slip occurs on p.32 about functional data
types:

	   A symbol may serve as a function;  an attempt to invoke a
	symbol as a function causes the contents of the symbol's
	function cell to be used.  See symbol-function and defun.