doc(deprecated) Document more API between the old and the new one.

lib/deprecated/runtime-core/doc/old-api/table.rs

@@ -0,0 +1,10 @@
+struct Table {}
+
+impl Table {
+    fn new(desc: TableDescriptor) -> Result<Self, CreationError>;
+    fn descriptor(&self) -> TableDescriptor;
+    fn set<T: StorableInTable>(&self, index: u32, element: T) -> Result<(), TableAccessError>;
+    fn size(&self) -> u32;
+    fn grow(&self, delta: u32) -> Result<u32, GrowError>;
+    fn vm_local_table(&mut self) -> *mut LocalTable;
+}