Adding more explanation of glossary formatting

The glossary would go here, formatted as:

~~~

{:auto_ids}

key word 1

:   explanation 1

~~~

{: .source}

which renders as:

(`{:auto_ids}` is needed at the start

so that Jekyll will automatically generate a unique ID for each item

to allow other pages to hyperlink to specific glossary entries.)

This renders as:

{:auto_ids}

key word 1