docs (#149): enforce consistent quotes

Co-authored-by: Natalia Tepluhina <[email protected]>

Author: bencodezen

src/guide/migration/attribute-coercion.md

@@ -42,7 +42,7 @@ We can see from the table above, current implementation coerces `true` to `'true
 
 ## 3.x Syntax
 
-We intend to drop this internal concept of “enumerated attributes” and treat them as normal non-boolean HTML attributes.
+We intend to drop this internal concept of "enumerated attributes" and treat them as normal non-boolean HTML attributes.
 
 - This solves the inconsistency between normal non-boolean attributes and “enumerated attributes”
 - It also makes it possible to use values other than `'true'` and `'false'`, or even keywords yet to come, for attributes like `contenteditable`