MDL-67970 output: use div for content wraping instead of span

span is not a valid content wrapper tag.
Moreover, according to W3C validation service report, it is not valid to
have div elements as children of a span element.
We can safely replace span with div here because the element's css class
is .action and display of .action is set to flex in both boost and
classic themes.

completion/tests/behat/behat_completion.php

@@ -170,7 +170,7 @@ public function activity_has_configuration_completion_checkbox($activityname, $a
         }
         $iconxpath = "//li[contains(concat(' ', @class, ' '), ' modtype_" . strtolower($activitytype) . " ')]";
         $iconxpath .= "[descendant::*[contains(text(), '" . $activityname . "')]]";
-        $iconxpath .= "/descendant::span[@class='actions']/descendant::img[contains(@src, 'i/completion-')]";
+        $iconxpath .= "/descendant::div[@class='actions']/descendant::img[contains(@src, 'i/completion-')]";
 
         $this->execute("behat_general::the_attribute_of_should_contain",
             array("src", $iconxpath, "xpath_element", $imgname)
@@ -193,7 +193,7 @@ public function activity_has_status_completion_checkbox($activityname, $activity
         }
         $iconxpath = "//li[contains(concat(' ', @class, ' '), ' modtype_" . strtolower($activitytype) . " ')]";
         $iconxpath .= "[descendant::*[contains(text(), '" . $activityname . "')]]";
-        $iconxpath .= "/descendant::span[@class='actions']/descendant::img[contains(@src, 'i/completion-')]";
+        $iconxpath .= "/descendant::div[@class='actions']/descendant::img[contains(@src, 'i/completion-')]";
 
         $this->execute("behat_general::the_attribute_of_should_contain",
             array("src", $iconxpath, "xpath_element", $imgname)

course/renderer.php

@@ -927,7 +927,7 @@ public function course_section_cm($course, &$completioninfo, cm_info $mod, $sect
         $modicons .= $this->course_section_cm_completion($course, $completioninfo, $mod, $displayoptions);
 
         if (!empty($modicons)) {
-            $output .= html_writer::span($modicons, 'actions');
+            $output .= html_writer::div($modicons, 'actions');
         }
 
         // Show availability info (if module is not available).