SE-0447: Fix self-link (#2573)

Author: DougGregor

proposals/0447-span-access-shared-contiguous-storage.md

@@ -1,6 +1,6 @@
 # Span: Safe Access to Contiguous Storage
 
-* Proposal: [SE-0447](0447-safe-shared-contiguous-storage.md)
+* Proposal: [SE-0447](0447-span-access-shared-contiguous-storage.md)
 * Authors: [Guillaume Lessard](https://github.com/glessard), [Michael Ilseman](https://github.com/milseman), [Andrew Trick](https://github.com/atrick)
 * Review Manager: [Doug Gregor](https://github.com/DougGregor)
 * Status: **Active review (September 17...October 1, 2024)**