Address nits for PR for #9629

Author: nikomatsakis

src/librustc/middle/borrowck/doc.rs

@@ -650,7 +650,7 @@ The rule for mutable borrowed pointers is as follows:
 
 Let's examine the two numbered clauses:
 
-Clause (1) specifies that tThe lifetime of the loan (`LT`) cannot
+Clause (1) specifies that the lifetime of the loan (`LT`) cannot
 exceed the lifetime of the `&mut` pointer (`LT'`). The reason for this
 is that the `&mut` pointer is guaranteed to be the only legal way to
 mutate its referent -- but only for the lifetime `LT'`.  After that

src/librustc/middle/borrowck/mod.rs

@@ -671,7 +671,7 @@ impl BorrowckCtxt {
                 // supposed to be going away.
                 format!("unsafe borrow of aliasable, const value")
             }
-            err_borrowed_pointer_too_short(_, _, r) => {
+            err_borrowed_pointer_too_short(..) => {
                 let descr = match opt_loan_path(err.cmt) {
                     Some(lp) => format!("`{}`", self.loan_path_to_str(lp)),
                     None => self.cmt_to_str(err.cmt),