chore: consolidate memory recommendations for Velocity

Author: olijeffers0n

docs/velocity/admin/getting-started/README.mdx

@@ -31,7 +31,7 @@ proxy files.
 
 ```batch title="start.bat"
 @echo off
-java -Xms512M -Xmx512M -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:+UnlockExperimentalVMOptions -XX:+ParallelRefProcEnabled -XX:+AlwaysPreTouch -jar velocity.jar
+java -Xms1G -Xmx1G -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:+UnlockExperimentalVMOptions -XX:+ParallelRefProcEnabled -XX:+AlwaysPreTouch -jar velocity.jar
 pause
 ```