Fix MArray constructor docstring (#711)

simonbyrne · c42f · commit 4f93bf672548 · 2020-01-04T08:09:34.000+10:00
`MArray{S,T,L}()` throws an error.
diff --git a/src/MArray.jl b/src/MArray.jl
@@ -1,5 +1,5 @@
 """
-    MArray{S, T, L}()
+    MArray{S, T, L}(undef)
     MArray{S, T, L}(x::NTuple{L, T})
     MArray{S, T, L}(x1, x2, x3, ...)
 
