docs: note about existing content at same path on different branches

vintro

2023-08-14 f1c9ca495e450ecb62dade70c4b60d86e106f79c

 quartz/trace.ts

@@ -11,10 +11,10 @@
  lines.push("")
  lines.push(
    "\n" +
    chalk.bgRed.black.bold(" ERROR ") +
    "\n" +
    chalk.red(` ${msg}`) +
    (err.message.length > 0 ? `: ${err.message}` : ""),
      chalk.bgRed.black.bold(" ERROR ") +
      "\n" +
      chalk.red(` ${msg}`) +
      (err.message.length > 0 ? `: ${err.message}` : ""),
  )

  if (!stack) {