Add desctiption about implicit slicing on foreach statement

statement.dd

@@ -687,7 +687,26 @@ $(H4 $(LEGACY_LNAME2 foreach_with_ranges, foreach-with-ranges, Foreach over Stru
     $(P If the aggregate expression is a struct or class object, but the
         $(D opApply) for $(D foreach), or $(D opApplyReverse) $(D foreach_reverse) do not exist,
         then iteration over struct and class objects can be done with range primitives.
-        For $(D foreach), this means the following properties and methods must
+    )
+
+    $(P First, the $(I ForeachAggregate) will be checked for a slice operator
+        $(D []) to try to get a range object from non-iterable containera:
+    )
+
+        ---
+        foreach (e; container) { ... }
+        ---
+
+    $(P is translates to:)
+
+        ---
+        foreach (e; container[]) { ... }
+        ---
+
+    $(P if possible.
+    )
+
+    $(P For $(D foreach), this means the following properties and methods must
         be defined:
     )