Update startup.mdx

src/content/docs/tools/startup.mdx

@@ -40,15 +40,13 @@ Java flags are used to improve server performance and client stuttering by tunin
 
 JVM flags go __before__ the `-jar` flag.
 
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-### Aikar flags
+#### Aikar flags
 
 Aikar's flags, while very well optimized for older Java versions, have not been updated since its creation and are severely out of date for modern Java versions. If you are running a 1.17+ Minecraft Java server (and use java 16+), it is recommended to use more up-to-date flags.
 
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-### Hilltty flags
+#### Hilltty flags
 
 These flags are a more up to date version of Aikar's flags designed for modern versions of Java (16 and 17) which should perform better. You can check the startup scripts [here](https://github.com/hilltty/hilltty-flags/blob/main/english-lang.md).