message: Update sx props doc
diff: title: Overriding styles with the sx prop
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  -Our goal with Primer Components is to hit the sweet spot between providing too little and too much ability to override styles. Our components already support a standard set of [system props](/system-props), but sometimes a component just isn't *quite* flexible enough to look the way you need it to look. For those cases, we provide the `sx` prop.
  +Our goal with Primer Components is to hit the sweet spot between providing too little and too much styling flexibility; too little and the design system is too rigid, and too much and it becomes too difficult to maintain a consistent style. Our components already support a standard set of [system props](/system-props), but sometimes a component just isn't *quite* flexible enough to look the way you need it to look. For those cases, we provide the `sx` prop.
  The `sx` prop allows ad-hoc styling that is still theme aware. Declare the styles you want to apply in camel-cased object notation, and any values use appropriate theme values; for example, any `color` property values will use the values from the `colors` key in the theme.
  