TODO: Finish records section (modules and headers)

[oubiwann]

LFE:

• http://lfe.io/tutorial/records/index.html
• http://lfe.io/tutorial/records/mods.html
• http://lfe.io/tutorial/records/headers.html

Erlang:

• https://erlang.org/doc/getting_started/record_macros.html
• https://erlang.org/doc/getting_started/record_macros.html#header-files
• https://erlang.org/doc/getting_started/record_macros.html#the-larger-example-divided-into-several-files