gsl-1.1.1 and gsl-1.2: documentation errors in doc/*.texi

gsl-1.1.1 and gsl-1.2: documentation errors in doc/*.texi

[Nelson H. F. Beebe]

In gsl-1.2, gsl-1.1.1, and possibly earlier releases, there is a small
but significant documentation error in doc/specfunc-gamma.texi:

 - Function: int gsl_sf_gamma_inc_Q_e (double A, double X,
          gsl_sf_result * RESULT)
     These routines compute the normalized incomplete Gamma Function
     P(a,x) = 1/\Gamma(a) \int_x\infty dt t^{a-1} \exp(-t) for a > 0, x

     ^---------------------- should be Q

     >= 0.

Two other errors noted:

In doc/fitting.texi:374
The two remaining columns corresponds to the terms @math{c_1 x} and and
                                                                    ^^^^doubled word

In doc/histogram.texi:1239
uniformly distributed over the the area of the original bins.
                               ^^^^doubled word

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