For merged BEPs point to their ".link" not bep page (bids-standard#666)

Author: yarikoptic

templates/beps_table_md.jinja

@@ -6,5 +6,5 @@
 | :--------: | :---- | :-----  | :-----  |
 {% endif %}
 {% for bep in include %}
-| [BEP {{ bep.number }}](./beps/bep_{{ bep.number }}.md) | {% if bep.display %} {{ bep.display }} {% else %} {{ bep.title }} {% endif %} | {% for content in bep.content %} {{ content }} {% endfor %} | {% for person in bep.leads %} {% if person.email %} [{{ person["given-names"] }} {{ person["family-names"] }}](mailto:{{ person.email }}) {% else %} {{ person["given-names"] }} {{ person["family-names"] }} {% endif %}<br>{% endfor %} |
+| [BEP {{ bep.number }}]({% if bep.link %}{{ bep.link }}{% else %}./beps/bep_{{ bep.number }}.md{% endif %}) | {% if bep.display %} {{ bep.display }} {% else %} {{ bep.title }} {% endif %} | {% for content in bep.content %} {{ content }} {% endfor %} | {% for person in bep.leads %} {% if person.email %} [{{ person["given-names"] }} {{ person["family-names"] }}](mailto:{{ person.email }}) {% else %} {{ person["given-names"] }} {{ person["family-names"] }} {% endif %}<br>{% endfor %} |
 {% endfor %}