turn link to RFC 1751 into a markdown link

diff --git a/src/librustc_borrowck/borrowck/README.md b/src/librustc_borrowck/borrowck/README.md
index fb70a6c3e848c03c0536fc5521ae5b76005a1039..b877c5a9cbcbcccbb7ec2d8d2b728f41c0a709da 100644 (file)
--- a/src/librustc_borrowck/borrowck/README.md
+++ b/src/librustc_borrowck/borrowck/README.md
@@ -781,7 +781,7 @@ the base path, it will still be considered freezable.
 
 
 
-**FIXME(https://github.com/rust-lang/rfcs/issues/1751)
+**FIXME [RFC 1751](https://github.com/rust-lang/rfcs/issues/1751)
 Restrictions against mutating the base pointer.**
 When an `&mut` pointer is frozen or claimed, we currently pass along the
 restriction against MUTATE to the base pointer. I do not believe this