Use class attribute in embedded links to reduce span elements

[damithc]

In many places where embedded links are used, the inside <span class="embedded-link"> element can be eliminated by adding class="embedded-link" to the outside <span> element.
This code

<span onclick="getContentUsingAjax('handbook-project-v04', '#embedded-week11-handbook');">
    <span class="embedded-link">V0.4 Requirements</span>
</span>

can be shortened as

<span onclick="getContentUsingAjax('handbook-project-v04', '#embedded-week11-handbook');" class="embedded-link">
    V0.4 Requirements
</span>