minor fixes

Author: iliakan

1-js/99-js-misc/05-bigint/article.md

@@ -91,9 +91,9 @@ if (0n) {
 Boolean operators, such as `||`, `&&` and others also work with bigints similar to numbers:
 
 ```js run
-alert( 1n || 2 ); // 1
+alert( 1n || 2 ); // 1 (1n is considered truthy)
 
-alert( 0n || 2 ); // 2
+alert( 0n || 2 ); // 2 (0n is considered falsy)
 ```
 
 ## Polyfills