So i centered the point in my previews answer.
The & (ampersand), should be used escaped in html, even into link's querystrings, so it's better to write & instead of the simple &.
Although is commonly used unescaped, as a matter of fact it works in both ways, it's a formal error in html specs not to use the html entity for it, and ST is doing well highlighting it.
This gives you 3 options:
1) just ignore it (like i do),
2) use & in your code,
3) tweak/change html.tmlanguage