Apply <strong> color to material-icons class

[eric-schneider]

When referencing a button icon in the documentation, the Google Developer Documentation Style Guide recommends placing the icon inline with the text, immediately followed by the name of the button in bold.

<span class="material-icons" aria-hidden="true" translate="no">more_vert</span> <b>Settings and utilities</b>

To achieve this in AsciiDoc, you'd use the following syntax:

[.material-icons]#more_vert# *Settings and utilities*

<span class="material-icons">more_vert</span> <strong>Settings and utilities</strong>

However, with our current UI, this results in the bold text having a different color than the icon, which diminishes the icon:

Ideally, the icon and the name of the icon should be the same color, e.g.

(See discussion for background on the style discussions related to this issue.)