docstring for HostWrite ctor

src/Omega_h_array.hpp

@@ -162,7 +162,21 @@ class HostWrite {
   using value_type = T;
   HostWrite() = default;
   HostWrite(LO size_in, std::string const& name = "");
+
+  /**
+ * \brief Constructs a HostWrite object with specified size, offset, and stride.
+ *
+ * \param size_in The number of elements in the array.
+ * \param offset The initial value to set for the first element in the array.
+ * \param stride The difference between the values of consecutive elements in the array.
+ * \param name The name of the array for identification purposes (default is an empty string).
+ *
+ * This constructor initializes a HostWrite array with the given size, setting the first element to the specified offset,
+ * and each subsequent element to the previous element's value plus the stride. The array is given a name for identification.
+ * For example, `HostWrite<Real> h_write(10, 7.0, 0.0);` will create a write array of size 10 and all filled with 7.0.
+ */
   HostWrite(LO size_in, T offset, T stride, std::string const& name = "");
+
   HostWrite(Write<T> write_in);
   HostWrite(std::initializer_list<T> l, std::string const& name = "");
   Write<T> write() const;