Fix docstring for speye(S)

Author: martinholters

base/sparse/sparsematrix.jl

@@ -992,7 +992,7 @@ speye(m::Integer, n::Integer) = eye(SparseMatrixCSC, m, n)
 """
     speye(S)
 
-Create a sparse identity matrix with the same structure as that of  `S`.
+Create a sparse identity matrix with the same size and element type as `S`.
 """
 speye{T}(S::SparseMatrixCSC{T}) = eye(SparseMatrixCSC{T}, size(S, 1), size(S, 2))
 eye{T<:SparseMatrixCSC}(S::T) = eye(T, S)

doc/stdlib/arrays.rst

@@ -908,7 +908,7 @@ dense counterparts. The following functions are specific to sparse arrays.
 
    .. Docstring generated from Julia source
 
-   Create a sparse identity matrix with the same structure as that of  ``S``\ .
+   Create a sparse identity matrix with the same size and element type as ``S``\ .
 
 .. function:: spdiagm(B, d[, m, n])