Here's how to do this:

• Run a text search (or a semantic search, described later) against your documentation to find content that looks like it could be relevant to the user's question.
• Grab extracts of that content and glue them all together into a blob of text.
• Construct a prompt consisting of that text followed by "Given the above content, answer the following question: " and the user's question
• Send the whole thing through the GPT-3 API and see what comes back