mx js does not need --jdk jvmci anymore.

Author: woess

docs/Building.md

@@ -91,7 +91,7 @@ mx js [OPTION]... [FILE]...
 Assuming that you also built the GraalVM compiler (using the instructions in `graal/compiler/README.md`), here is how you can use it to run GraalVM JavaScript:
 ```bash
 cd graaljs/graal-js
-mx --dynamicimports /compiler --jdk jvmci js [OPTION]... [FILE]...
+mx --dynamicimports /compiler js [OPTION]... [FILE]...
 ```
 
 
@@ -130,7 +130,7 @@ mx node [OPTION]... [FILE]...
 Assuming that you also built the GraalVM Compiler (using the instructions in `graal/compiler/README.md`), here is how you can use it to run Node.js on GraalVM JavaScript:
 ```bash
 cd graaljs/graal-nodejs
-mx --dynamicimports /compiler --jdk jvmci node [OPTION]... [FILE]...
+mx --dynamicimports /compiler node [OPTION]... [FILE]...
 ```