Fixed extra links example

[piotr-zyskowski-rai]

PR description

This PR fixes extra links field example in the docs.

Why is it needed?

Documentation describing need/req's extra links has an incorrect example - outgoing dictionary entry is missing:

# conf.py
needs_extra_links = [
   {
      "option": "blocks",
      "incoming": "is blocked by",
   },
   {
      "option": "tests",
      "incoming": "is tested by",
      "copy": False,
      "color": "#00AA00"
   }
]

When used it causes this error:

Extension error (sphinx_needs.directives.need):
Handler <function process_need_nodes at 0x7f5d5123e9e0> for event 'doctree-resolved' threw an exception (exception: 'outgoing')

Documentation of needs_extra_links (here) states that the outgoing field is necessary and the example above is unnecessarily misleading.

[danwos]

Thanks for fixing the docs 👍