Fix forgotten conj(alpha) in her2k documentation (#1480)

Author: Technici4n

src/blas.jl

@@ -2102,7 +2102,7 @@ end
     her2k!(uplo, trans, alpha, A, B, beta, C)
 
 Rank-2k update of the Hermitian matrix `C` as
-`alpha*A*B' + alpha*B*A' + beta*C` or `alpha*A'*B + alpha*B'*A + beta*C`
+`alpha*A*B' + alpha'*B*A' + beta*C` or `alpha*A'*B + alpha'*B'*A + beta*C`
 according to [`trans`](@ref stdlib-blas-trans). The scalar `beta` has to be real.
 Only the [`uplo`](@ref stdlib-blas-uplo) triangle of `C` is used. Return `C`.
 """
@@ -2111,8 +2111,8 @@ function her2k! end
 """
     her2k(uplo, trans, alpha, A, B)
 
-Return the [`uplo`](@ref stdlib-blas-uplo) triangle of `alpha*A*B' + alpha*B*A'`
-or `alpha*A'*B + alpha*B'*A`, according to [`trans`](@ref stdlib-blas-trans).
+Return the [`uplo`](@ref stdlib-blas-uplo) triangle of `alpha*A*B' + alpha'*B*A'`
+or `alpha*A'*B + alpha'*B'*A`, according to [`trans`](@ref stdlib-blas-trans).
 """
 her2k(uplo, trans, alpha, A, B)