Update docs/community/sep-guidelines.mdx

Co-authored-by: Paul Carleton <[email protected]>

Author: dsp-ant

docs/community/sep-guidelines.mdx

@@ -65,7 +65,7 @@ SEPs are reviewed by the MCP core maintainers team on a bi-weekly basis.
 
 For a SEP to be accepted it must meet certain minimum criteria:
 
-- A complete implementation demonstrating the proposal
+- A prototype implementation demonstrating the proposal
 - Clear benefit to the MCP ecosystem
 - Community support and consensus