Updates to travel fund policy

[tobie]

Tasks

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1. Mention speakers are covered through a separate fund, add link to fund
2. State that the cadence of CPC review might be > monthly
3. Clarify whether the fund covers attendance to event (no collab summit) where requester isn't speaking
4. Mention flexibility around deadlines
5. Have a process to capture estimated travel fund needs from different projects and collab space #1181
   TOPIC-travel-fund +1
6. Something we should add in the guide for the Travel Fund is to send the final invoice as quickly as possible. This will allow others to use the funds that were allocated but not spent. (See Add travel fund 2023 transparency report #1259 (comment))