hvcat doc example fixed

[mbeltagy]

hvcat doc example was not working
I changed it to one that does.

[tkelman]

Note that the docstrings in the file you edited are auto-generated. The same change would also need to be made at the source for the docstring,

julia/base/docs/helpdb.jl

Line 3795 in 6aa15b8

Horizontal and vertical concatenation in one call. This function is called for block matrix syntax. The first argument specifies the number of arguments to concatenate in each block row. For example, `[a b;c d e]` calls `hvcat((2,3),a,b,c,d,e)`.

[dpsanders]

Probably the example would be clearer with a 2x3 matrix, as was originally (presumably) intended:

julia> a, b, c, d, e, f = 1, 2, 3, 4, 5, 6
(1,2,3,4,5,6)

julia> [a b c; d e f]
2x3 Array{Int64,2}:
 1  2  3
 4  5  6

This can then be a doctest.

[mbeltagy]

I fixed that now with a couple of clear doctest examples in my last commit.

[tkelman]

please remove the trailing whitespace from here and 3810, and if you've got a local source build it would also be handy if you could run make && usr/bin/julia doc/genstdlib.jl on this branch to propagate these changes into the RST.

[mbeltagy]

I followed your instructions. The latest commit should be good.

[tkelman]

Looks good, thanks!