Update comment

package_manager/src/ProcessFactory.php

@@ -74,7 +74,8 @@ final class ProcessFactory implements ProcessFactoryInterface {
     if ($this->isComposerCommand($command)) {
       $env['COMPOSER_HOME'] = $this->getComposerHomePath();
     }
-    // Ensure that the PHP interpreter is in the PATH.
+    // Ensure that the current PHP installation is the first place that will be
+    // searched when looking for the PHP interpreter.
     $env['PATH'] = static::getPhpDirectory() . ':' . $this->getEnv('PATH');
     return $process->setEnv($env);
   }