manual: remove 'analogy' between return and return. meaningless.

Author: graydon

doc/rust.md

@@ -2330,8 +2330,7 @@ return_expr : "return" expr ? ;
 ~~~~~~~~
 
 Return expressions are denoted with the keyword `return`. Evaluating a `return`
-expression^[A `return` expression is analogous to a `return` expression
-in the C family.] moves its argument into the output slot of the current
+expression moves its argument into the output slot of the current
 function, destroys the current function activation frame, and transfers
 control to the caller frame.