Add strict CSS locator example for see() and dontSee()

src/Codeception/Lib/Interfaces/Web.php

@@ -26,9 +26,10 @@ public function amOnPage($page);
      *
      * ``` php
      * <?php
-     * $I->see('Logout');                 // I can suppose user is logged in
-     * $I->see('Sign Up', 'h1');          // I can suppose it's a signup page
-     * $I->see('Sign Up', '//body/h1');   // with XPath
+     * $I->see('Logout');                        // I can suppose user is logged in
+     * $I->see('Sign Up', 'h1');                 // I can suppose it's a signup page
+     * $I->see('Sign Up', '//body/h1');          // with XPath
+     * $I->see('Sign Up', ['css' => 'body h1']); // with strict CSS locator
      * ```
      *
      * Note that the search is done after stripping all HTML tags from the body,
@@ -56,9 +57,10 @@ public function see($text, $selector = null);
      *
      * ```php
      * <?php
-     * $I->dontSee('Login');                    // I can suppose user is already logged in
-     * $I->dontSee('Sign Up','h1');             // I can suppose it's not a signup page
-     * $I->dontSee('Sign Up','//body/h1');      // with XPath
+     * $I->dontSee('Login');                         // I can suppose user is already logged in
+     * $I->dontSee('Sign Up','h1');                  // I can suppose it's not a signup page
+     * $I->dontSee('Sign Up','//body/h1');           // with XPath
+     * $I->dontSee('Sign Up', ['css' => 'body h1']); // with strict CSS locator
      * ```
      *
      * Note that the search is done after stripping all HTML tags from the body,