Improve wording and grammar in docstrings

;; Multivariate minimization.

;; Liam Healy  <Tue Jan  8 2008 - 21:28>

;; Time-stamp: <2011-08-17 00:50:24EDT minimization-multi.lisp>

;; Time-stamp: <2011-09-28 13:30:49EDT minimization-multi.lisp>

;;

;; Copyright 2008, 2009, 2011 Liam M. Healy

;; Distributed under the terms of the GNU General Public License

  ((type :pointer) ((first dimensions) sizet))

  "multi-dimensional minimizer with function only"

  :documentation			; FDL

  "Make an instance of a minimizer of the given for an function of the

   given dimensions.  Optionally initialize the minimizer to minimize

   the function starting from the initial point.  The size of the

   initial trial steps is given in vector step-size. The precise

   meaning of this parameter depends on the method used."

  "Make an instance of a minimizer for a function of the given

   dimensions without derivative.  Optionally initialize the minimizer

   to minimize the function starting from the initial point.  The size

   of the initial trial steps is given in vector step-size. The

   precise meaning of this parameter depends on the method used."

  :callbacks

  (callback fnstruct-dimension (dimension)

	    (function :double (:input :double :foreign-array dim0) :slug))

  ((type :pointer) ((first dimensions) sizet))

  "multi-dimensional minimizer with function and derivative"

  :documentation			; FDL

  "Make an instance of a derivative-based minimizer of the given for

   an function of the given dimensions.  Optionally initialize the

   minimizer to minimize the function starting from the initial point.

   The size of the first trial step is given by step-size.  The

   accuracy of the line minimization is specified by tolernace.  The

   precise meaning of this parameter depends on the method used.

   Typically the line minimization is considered successful if the

   gradient of the function g is orthogonal to the current search

   direction p to a relative accuracy of tolerance, where dot(p,g) <

   tol |p| |g|."

  "Make an instance of a minimizer for a function of the given

   dimensions with a derivative.  Optionally initialize the minimizer

   to minimize the function starting from the initial point.  The size

   of the first trial step is given by step-size.  The accuracy of the

   line minimization is specified by tolernace.  The precise meaning

   of this parameter depends on the method used.  Typically the line

   minimization is considered successful if the gradient of the

   function g is orthogonal to the current search direction p to a

   relative accuracy of tolerance, where dot(p,g) < tol |p| |g|."

  :callbacks

  (callback fnstruct-dimension-fdf (dimension)

	    (function :double (:input :double :foreign-array dim0) :slug)