"Sparking a fire" is the same as lighting a fire. You do something (light a match, light a cigarette lighter, strike flint against steel) that starts a fire. When you "spark a riot," you do something that creates the situation (start a fight, begin an argument, whatever) that leads to lots of people fighting, destroying property, and hurting each other. "Spark a riot" is a common phrase. To "sparkle a riot" you would show up at a riot with bags full of glitter. "Sparkle a riot" is not a common phrase.

Somebody made an error in transcription. The phrase is "to spark a riot." The literal reference is to set off a gun with a spark. Early guns used a "flintlock" mechanism. Striking a piece of the hard mineral, flint, against a piece of iron or steel, produce tiny bits of red-hot metal; these sparks can set fire to gunpowder. A little spark is enough to start a big explosion. The riot is like an explosion. The spark is the incident that starts the riot. For example: "The riot was sparked by the acquittal of four white policemen involved in a horrific beating of black motorist Rodney King..."

"Sparkle a riot" is incorrect. "To SPARK a riot" means to incite/start/begin a riot.