doc updates

src/macros.jl

@@ -83,6 +83,8 @@ Regular `*` is matrix multiplication, broadcasted `*` is elementwise multiplicat
 two have different gradients as defined above. `unbroadcast(a,b)` reduces `b` to the same
 shape as `a` by performing the necessary summations.
 """
+:(@primitive), :(@primitive1), :(@primitive2)
+
 macro primitive(f,g...)                         # @primitive sin(x::Number),dy,y  (dy.*cos.(x))
     (f,dy,y) = fparse(f)
     b = Expr(:block)
@@ -151,6 +153,8 @@ define the broadcasting version and `@zerograd2` if you only want to define the
 version. Note that `kwargs` are NOT unboxed.
 
 """
+:(@zerograd), :(@zerograd1), :(@zerograd2)
+
 macro zerograd(f)                               # @zerograd sign(x::Number)
     (f,dy,y) = fparse(f)
     b = Expr(:block)

test/gradcheck.jl

@@ -151,7 +151,7 @@ gradient of `sum(f(x...; kw...))`. Keyword arguments:
 * `verbose=1`: 0 prints nothing, 1 shows failing tests, 2 shows all tests.
 
 """
-gcheck, @gcheck
+gcheck, :(@gcheck)
 
 function gcheck(f, x...; kw=(), nsample=10, verbose=1, rtol=0.05, atol=0.01, delta=0.0001)
     y = @diff gcsum(f, x...; kw...)