Class name mismatch between developer guide and font's HTML code.

For example, in the material icons guide, we are instructed that the font's HTML .material-icon class will be there inside the tag. But when we copy the HTML code from the icon page, it gives .material-icon-outlined class inside the tag. Hence, only the text inside the tag is rendered rather than the actual icon. Screenshots have been included for further clarification.

Describe the bug
Class name mismatch between developer guide and icon's HTML code.

To Reproduce
1. Embed inside the head of HTML.
2. Copy any outlined icon's HTML code from the icon page.
3. Use the icon's HTML code inside the body of your HTML .
4. Instead, of the icon you will get the text inside the span tag.

Expected behaviour

I expected to have outlined material icons.

**Screenshots**
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**Additional context**
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