Fix typo

Co-authored-by: Travis Cross <[email protected]>

Author: Jules-Bertholet

text/3806-align-attr.md

@@ -489,7 +489,7 @@ precedes `mut`, it should precede `ref`/`ref mut` also.
 
 I believe the the correct time to resolve this question will be when we decide
 on a syntax for combining `ref`/`ref mut` with `mut`. If we choose a syntax that
-make it clear that these are distinct elements:
+makes it clear that these are distinct elements:
 
 ```rust
 let ref (mut x) = …;