minor fixes

Author: iliakan

1-js/02-first-steps/15-function-basics/article.md

@@ -181,7 +181,7 @@ In other words, to put these terms straight:
 
 We declare functions listing their parameters, then call them passing arguments.
 
-In the example above, one might say: "the function `sayMessage` is declared with two parameters, then called with two arguments: `from` and `"Hello"`".
+In the example above, one might say: "the function `showMessage` is declared with two parameters, then called with two arguments: `from` and `"Hello"`".
 
 ## 기본값