Docs: fix grammar in “those who says” (#11390)

Changed “those who says” to “those who say”.

docs/rules/semi.md

@@ -31,7 +31,7 @@ return;
 
 Effectively, a semicolon is inserted after the `return` statement, causing the code below it (a labeled literal inside a block) to be unreachable. This rule and the [no-unreachable](no-unreachable.md) rule will protect your code from such cases.
 
-On the other side of the argument are those who says that since semicolons are inserted automatically, they are optional and do not need to be inserted manually. However, the ASI mechanism can also be tricky to people who don't use semicolons. For example, consider this code:
+On the other side of the argument are those who say that since semicolons are inserted automatically, they are optional and do not need to be inserted manually. However, the ASI mechanism can also be tricky to people who don't use semicolons. For example, consider this code:
 
 ```js
 var globalCounter = { }