Merge pull request #299 from rust-lang/LukasKalbertodt-patch-1

Add `C-tracking-issue` tag to RFC merge procedure

Author: jonas-schievink

src/lang/rfc-merge-procedure.md

@@ -34,6 +34,7 @@ not forgotten
 Add the following labels to the issue:
 
 - `B-rfc-approved`
+- `C-tracking-issue`
 - the approriate `T-XXX` label
 
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