Fix typo in docs (#1821)

Author: pixelass

docs/rules/numeric-separators-style.md

@@ -50,7 +50,7 @@ Example:
 
 ```js
 // eslint unicorn/numeric-separators-style: ["error", {"onlyIfContainsSeparator": true, "binary": {"onlyIfContainsSeparator": false}]
-const number = 100000; // Pass, this number does not contains separators
+const number = 100000; // Pass, this number does not contain separators
 const binary = 0b101010001; // Fail, `binary` type don't require separators
 const hexadecimal = 0xD_EED_BEE_F; // Fail, it contain separators and it's incorrectly grouped
 ```