Docs: Remove claim about semicolons from docs (#12944)

The documentation claimed that JS is unique among
C-like languages in having optional semicolons at
the end of statements. This is not true, as Go (Golang)
also has optional semicolons and is C-like.

This didn't seem terribly important, so rather than
go on a tangent about what languages do or don't require
semicolons, I just removed the claim.

docs/rules/semi.md

@@ -1,6 +1,6 @@
 # require or disallow semicolons instead of ASI (semi)
 
-JavaScript is unique amongst the C-like languages in that it doesn't require semicolons at the end of each statement. In many cases, the JavaScript engine can determine that a semicolon should be in a certain spot and will automatically add it. This feature is known as **automatic semicolon insertion (ASI)** and is considered one of the more controversial features of JavaScript. For example, the following lines are both valid:
+JavaScript doesn't require semicolons at the end of each statement. In many cases, the JavaScript engine can determine that a semicolon should be in a certain spot and will automatically add it. This feature is known as **automatic semicolon insertion (ASI)** and is considered one of the more controversial features of JavaScript. For example, the following lines are both valid:
 
 ```js
 var name = "ESLint"