Fixed comment in egl.h and eglext.h headers (#117)

* Fixed comment in egl.h and eglext.h headers

* Fix genheaders.py for a comment warning in text prefixing headers
diff --git a/api/EGL/egl.h b/api/EGL/egl.h
index 00c571e..2c5990c 100644
--- a/api/EGL/egl.h
+++ b/api/EGL/egl.h
@@ -8,7 +8,7 @@
 /*
 ** Copyright 2013-2020 The Khronos Group Inc.
 ** SPDX-License-Identifier: Apache-2.0
-/*
+**
 ** This header is generated from the Khronos EGL XML API Registry.
 ** The current version of the Registry, generator scripts
 ** used to make the header, and the header can be found at
diff --git a/api/EGL/eglext.h b/api/EGL/eglext.h
index 823e22c..904ee84 100644
--- a/api/EGL/eglext.h
+++ b/api/EGL/eglext.h
@@ -8,7 +8,7 @@
 /*
 ** Copyright 2013-2020 The Khronos Group Inc.
 ** SPDX-License-Identifier: Apache-2.0
-/*
+**
 ** This header is generated from the Khronos EGL XML API Registry.
 ** The current version of the Registry, generator scripts
 ** used to make the header, and the header can be found at
diff --git a/api/genheaders.py b/api/genheaders.py
index 494d0de..ce15d6d 100755
--- a/api/genheaders.py
+++ b/api/genheaders.py
@@ -72,7 +72,7 @@
     '/*',
     '** Copyright 2013-2020 The Khronos Group Inc.',
     '** SPDX-' + 'License-Identifier: Apache-2.0',
-    '/*',
+    '**',
     '** This header is generated from the Khronos EGL XML API Registry.',
     '** The current version of the Registry, generator scripts',
     '** used to make the header, and the header can be found at',