Add a note about GC considerations with atoms

elixir/dynamically-generating-atoms.md

@@ -1,15 +0,0 @@
-# Dynamically Generating Atoms
-
-> Atoms are constants where their name is their own value.
-
-The use of atoms like `:ok` and `:error` show up all over the place in
-Elixir. These are atoms that tend to be statically defined. Atoms can also
-be dynamically defined using string interpolation.
-
-For example, I can generate a handful of atoms by mapping over a range of
-integers.
-
-```elixir
-> Enum.map(1..5, &(:"some_atom_#{&1}"))
-[:some_atom_1, :some_atom_2, :some_atom_3, :some_atom_4, :some_atom_5]
-```