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API docs: LSIF: add basic heuristics for usage examples

Administrator requested to merge sg/apidocs-usage-examples into main

Created by: slimsag

For usage examples to be added to API docs, I've encountered two problems:

  1. The first reference found is often the definition itself, which is definitely useless.
  2. The other references found are often in the same file as the definition - which don't show usage of the API very effectively.

What I've done here is hacked around the problem a bit by adding some very minimal heuristics that exclude these two types of references in DocumentationReferences requests.

Longer term, I will make this an option in the GraphQL layer (examples: true) and begin thinking about how we can apply ranking to usage examples (and, how that should apply to codeintel references more generally - not just in the context of API docs.) -- but for now, this small change means we can start having usage examples on Sourcegraph.com today - which seems a great win.

Signed-off-by: Stephen Gutekanst [email protected]

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