trpl: punctuation fix

diff --git a/src/doc/trpl/mutability.md b/src/doc/trpl/mutability.md
index 674d65974494ee14ba3d4105bc781070184fc3df..7186c65cdf424e0ec291e6c90d8c63e52389b74e 100644 (file)
--- a/src/doc/trpl/mutability.md
+++ b/src/doc/trpl/mutability.md
@@ -35,7 +35,7 @@ let y = &mut x;
 
 `y` is an immutable binding to a mutable reference, which means that you can’t
 bind `y` to something else (`y = &mut z`), but you can mutate the thing that’s
-bound to `y`. (`*y = 5`) A subtle distinction.
+bound to `y` (`*y = 5`). A subtle distinction.
 
 Of course, if you need both: