Clarify description.toJSON() returns RTCSessionDescriptionInit

[jan-ivar]

For clarity (we do this with RTCIceCandidate already).

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:boom: Error: 500 Internal Server Error :boom:

PR Preview failed to build. (Last tried on May 2, 2024, 5:10 PM UTC).

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PR Preview relies on a number of web services to run. There seems to be an issue with the following one: :rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec. :link: [Related URL]([object Object]) ``` 😭 Sorry, there was an error generating the HTML. Please report this issue! Specification: http://localhost:8082/uploads/QhHEKQ/webrtc.html?isPreview=true%3FisPreview%3Dtrue&publishDate=2024-05-02 ReSpec version: 12.2.2 File a bug: https://github.com/w3c/respec/ Error: TypeError: exportDocument is not a function at evaluateHTML (evaluate at generateHTML (file:///u/spec-generator/node_modules/respec/tools/respecDocWriter.js:229:23), :20:11) at #evaluate (file:///u/spec-generator/node_modules/puppeteer-core/lib/esm/puppeteer/cdp/ExecutionContext.js:219:19) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async ExecutionContext.evaluate (file:///u/spec-generator/node_modules/puppeteer-core/lib/esm/puppeteer/cdp/ExecutionContext.js:114:16) at async IsolatedWorld.evaluate (file:///u/spec-generator/node_modules/puppeteer-core/lib/esm/puppeteer/cdp/IsolatedWorld.js:121:16) at async CdpFrame.evaluate (file:///u/spec-generator/node_modules/puppeteer-core/lib/esm/puppeteer/api/Frame.js:350:20) at async CdpPage.evaluate (file:///u/spec-generator/node_modules/puppeteer-core/lib/esm/puppeteer/api/Page.js:814:20) at async generateHTML (file:///u/spec-generator/node_modules/respec/tools/respecDocWriter.js:229:12) at async toHTML (file:///u/spec-generator/node_modules/respec/tools/respecDocWriter.js:100:18) at async Object.generate [as respec] (file:///u/spec-generator/generators/respec.js:15:44) ``` _If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/webrtc-pc%232968.)._

[jan-ivar]

Whoops, wrong push. Please ignore