docs: remove out of date admonition (#2114)

Lumen Yang

2025-09-05 a4028289aae22f2a073b2837c3a85d9fc4a86087

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code[data-theme*=" "] {
  color: var(--shiki-light);
  background-color: var(--shiki-light-bg);
}
 
code[data-theme*=" "] span {
  color: var(--shiki-light);
}
 
[saved-theme="dark"] code[data-theme*=" "] {
  color: var(--shiki-dark);
  background-color: var(--shiki-dark-bg);
}
 
[saved-theme="dark"] code[data-theme*=" "] span {
  color: var(--shiki-dark);
}