minor fixes

1-js/02-first-steps/17-arrow-functions-basics/article.md

@@ -33,7 +33,7 @@ let sum = function(a, b) {
 alert( sum(1, 2) ); // 3
 ```
 
-As you can, see `(a, b) => a + b` means a function that accepts two arguments named `a` and `b`. Upon the execution, it evaluates the expression `a + b` and returns the result.
+As you can see, `(a, b) => a + b` means a function that accepts two arguments named `a` and `b`. Upon the execution, it evaluates the expression `a + b` and returns the result.
 
 - If we have only one argument, then parentheses around parameters can be omitted, making that even shorter.
 
@@ -86,7 +86,7 @@ Like this:
 let sum = (a, b) => {  // the curly brace opens a multiline function
   let result = a + b;
 *!*
-  return result; // if we use curly braces, then we need an explicit "return" 
+  return result; // if we use curly braces, then we need an explicit "return"
 */!*
 };