Update docs/community/sep-guidelines.mdx

Co-authored-by: Jonathan Hefner <[email protected]>

Author: dsp-ant

docs/community/sep-guidelines.mdx

@@ -29,7 +29,7 @@ Each SEP must have an **SEP author** -- someone who writes the SEP using the sty
 
 ### Submitting a SEP
 
-SEPs should be submitted as a GitHub Issue in the [specification repository](https://github.com/modelcontextprotocol/specification). The draft must be written in the style of this SEP and must include:
+SEPs should be submitted as a GitHub Issue in the [specification repository](https://github.com/modelcontextprotocol/modelcontextprotocol). The draft must be written in the style of this SEP and must include:
 
 - A clear and concise title
 - A written motivation and rationale for the change