Some fix to three files

src/error/result.md

@@ -5,8 +5,8 @@ describes possible *error* instead of possible *absence*.
 
 That is, `Result<T, E>` could have one of two outcomes:
 
-* `Ok<T>`: An element `T` was found
-* `Err<E>`: An error was found with element `E`
+* `Ok(T)`: An element `T` was found
+* `Err(E)`: An error was found with element `E`
 
 By convention, the expected outcome is `Ok` while the unexpected outcome is `Err`.
 

src/flow_control/match/binding.md

@@ -15,9 +15,9 @@ fn main() {
 
     match age() {
         0             => println!("I'm not born yet I guess"),
-        // Could `match` 1 ... 12 directly but then what age
+        // Could `match` 1 ..= 12 directly but then what age
         // would the child be? Instead, bind to `n` for the
-        // sequence of 1 .. 12. Now the age can be reported.
+        // sequence of 1 ..= 12. Now the age can be reported.
         n @ 1  ..= 12 => println!("I'm a child of age {:?}", n),
         n @ 13 ..= 19 => println!("I'm a teen of age {:?}", n),
         // Nothing bound. Return the result.

src/macros/dry.md

@@ -10,7 +10,7 @@ use std::ops::{Add, Mul, Sub};
 macro_rules! assert_equal_len {
     // The `tt` (token tree) designator is used for
     // operators and tokens.
-    ($a:ident, $b:ident, $func:ident, $op:tt) => {
+    ($a:expr, $b:expr, $func:ident, $op:tt) => {
         assert!($a.len() == $b.len(),
                 "{:?}: dimension mismatch: {:?} {:?} {:?}",
                 stringify!($func),