Heading update for clarity

Author: david-christiansen

proposals/PROPOSALS.md

@@ -77,7 +77,7 @@ For instance, a missing piece of prior art, a technical plan that is missing an
 All that's required is a good faith attempt to address these concerns in the first draft.
 
 
-### Pre-Proposal
+### Prior and Related Work
 Prior to submitting a detailed proposal, please post to the [Haskell Discourse instance](https://discourse.haskell.org/) with a summary of the proposal's contents and a subject line that begins with "Pre-HFTP:".
 Please use the "Haskell Foundation" category.
 This helps address the prior art and related efforts concerns, and can save time needed to rewrite a proposal in light of previously-unknown opportunities for collaboration.