Remove redundant example on structs and capturing

What this example is showing is how one field of a struct can be
captured while another is not (when using rest patterns).  However,
the example above demonstrates this with tuples, and there are no
interesting differences between tuple fields and struct fields in this
case.

Author: traviscross

src/types/closure.md

@@ -261,25 +261,6 @@ println!("{:?}", x.1);
 c();
 ```
 
-```rust
-struct Example {
-    f1: String,
-    f2: String,
-}
-
-let e = Example {
-    f1: String::from("first"),
-    f2: String::from("second"),
-};
-let c = || {
-    let Example { f2, .. } = e; // captures `e.f2` ByValue
-};
-// Field f2 cannot be accessed since it is moved into the closure.
-// Field f1 is still accessible.
-println!("{:?}", e.f1);
-c();
-```
-
 r[type.closure.capture.precision.wildcard.array-slice]
 Partial captures of arrays and slices are not supported; the entire slice or array is always captured even if used with wildcard pattern matching, indexing, or sub-slicing.