Fix typos in 'Proxy and Reflect'

1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md

@@ -19,5 +19,5 @@ function wrap(target) {
 user = wrap(user);
 
 alert(user.name); // John
-alert(user.age); // ReferenceError: Property doesn't exist "age"
+alert(user.age); // ReferenceError: Property doesn't exist: "age"
 ```

1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md

@@ -27,6 +27,6 @@ user = wrap(user);
 
 alert(user.name); // John
 *!*
-alert(user.age); // ReferenceError: Property doesn't exist "age"
+alert(user.age); // ReferenceError: Property doesn't exist: "age"
 */!*
 ```

1-js/99-js-misc/01-proxy/article.md

@@ -437,7 +437,7 @@ user = {
 ```
 
 
-A call to `user.checkPassword()` call gets proxied `user` as `this` (the object before dot becomes `this`), so when it tries to access `this._password`, the `get` trap activates (it triggers on any property read) and throws an error.
+A call to `user.checkPassword()` gets proxied `user` as `this` (the object before dot becomes `this`), so when it tries to access `this._password`, the `get` trap activates (it triggers on any property read) and throws an error.
 
 So we bind the context of object methods to the original object, `target`, in the line `(*)`. Then their future calls will use `target` as `this`, without any traps.