Proposed change to help text format

[Keith Goodman]

Current format followed by two proposed formats. (BTW, what does "see
*Note Linear Algebra::." mean?)

---------------------------------------------------------------------
octave:1> help log
log is a built-in mapper function

 -- Mapping Function:  log (X)
     Compute the natural logarithm for each element of X.  To compute
     the matrix logarithm, see *Note Linear Algebra::.
   See also: log2, log10, logspace, and exp.


---------------------------------------------------------------------
octave:2> help log
log (X)
   Compute the natural logarithm for each element of X.  To compute
   the matrix logarithm, see *Note Linear Algebra::.
  
   See also: log2, log10, logspace, and exp.

---------------------------------------------------------------------
octave:3> help log
log (X)
   Compute the natural logarithm for each element of X.  To compute
   the matrix logarithm, see *Note Linear Algebra::.

   log is a built-in mapper function.
  
   See also: log2, log10, logspace, and exp.

---------------------------------------------------------------------



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