Update rfcs/template.md

Co-authored-by: Aleksei Fedotov <[email protected]>

rfcs/template.md

@@ -41,7 +41,7 @@ Pay close attention to the following aspects of the library:
 
 Some other common subsections here are:
 - Discussion: some people like to list all the options first (as separate
-  subsections), and then have a dedicated section with the discussion/
+  subsections), and then have a dedicated section with the discussion.
 - Listing of the proposed API and examples of its usage.
 - Testing aspects.
 - Short explanation and links to the related sub-proposals, if any. Such