Rename eglot-java-vmargs and rewrite its docstring.

* eglot.el (eglot-eclipse-jdt-vmargs): Rename from eglot-java-vmargs.

eglot.el

@@ -3005,13 +3005,12 @@ If NOERROR, return predicate, else erroring function."
 
 ;;; eclipse-jdt-specific
 ;;;
-(defcustom eglot-java-vmargs '("-XX:+UseParallelGC" "-XX:GCTimeRatio=4" "-XX:AdaptiveSizePolicyWeight=90" "-Dsun.zip.disableMemoryMapping=true" "-Xmx1G" "-Xms100m")
+(defcustom eglot-eclipse-jdt-vmargs '()
   "Specifies extra VM arguments used to launch the Java Language Server.
-
-Eg. use `-noverify -Xmx1G -XX:+UseG1GC
--XX:+UseStringDeduplication` to bypass class
-verification,increase the heap size to 1GB and enable String
-deduplication with the G1 Garbage collector"
+For example, if you are a Lombok user, you can specify the argument needed here.
+You can also specify some arguments to reduce memory consumption.
+See https://github.com/redhat-developer/vscode-java/pull/1262 for more details.
+"
   :type '(repeat string))
 
 (defclass eglot-eclipse-jdt (eglot-lsp-server) ()
@@ -3096,7 +3095,7 @@ If INTERACTIVE, prompt user for details."
               "-Declipse.application=org.eclipse.jdt.ls.core.id1"
               "-Dosgi.bundles.defaultStartLevel=4"
               "-Declipse.product=org.eclipse.jdt.ls.core.product"
-              ,@eglot-java-vmargs
+              ,@eglot-eclipse-jdt-vmargs
               "-jar" ,jar
               "-configuration" ,config
               "-data" ,workspace)))))