Revise intro on wildcard patterns and capturing

Let's tighten up the wording a bit in the introduction to wildcard
patterns and capturing to make it better match how we'll present
things below.  We'll remove the "for example..." ahead of the example,
as we're not doing this below, and we'll separately extend the
comments within the examples to include the relevant information.

Author: traviscross

src/types/closure.md

@@ -186,9 +186,8 @@ If this were to capture `m`, then the closure would no longer outlive `'static`,
 r[type.closure.capture.precision.wildcard]
 ### Wildcard pattern bindings
 
-Closures only capture data that needs to be read.
-Binding a value with a [wildcard pattern] does not count as a read, and thus won't be captured.
-For example, the following closures will not capture `x`:
+r[type.closure.capture.precision.wildcard.reads]
+Closures only capture data that needs to be read. Binding a value with a [wildcard pattern] does not read the value, so the place is not captured.
 
 ```rust
 let x = String::from("hello");