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Update lifetime-elision.md (#1795)

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In the details section, it is suggested to adjust the signature of the
nearest function to "lie" about the lifetimes returned to:

fn nearest<'a, 'q'>(points: &'a [Point], query: &'q Point) -> Option<&'q
Point> {

to demonstrate the compiler checks lifetimes for validity. However, the
syntax for 'q is incorrect and it should instead be

fn nearest<'a, 'q>(points: &'a [Point], query: &'q Point) -> Option<&'q
Point> {
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src/slices-and-lifetimes/lifetime-elision.md
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@ -61,7 +61,7 @@ references in its arguments that requires explicit annotation.
Try adjusting the signature to "lie" about the lifetimes returned:
```rust,ignore
fn nearest<'a, 'q'>(points: &'a [Point], query: &'q Point) -> Option<&'q Point> {
fn nearest<'a, 'q>(points: &'a [Point], query: &'q Point) -> Option<&'q Point> {
```
This won't compile, demonstrating that the annotations are checked for validity