Make IDL for WebGLObject creation methods match the interface (KhronosGroup#3747)

Commit 97b78aa updated IDL code for
WebGL2RenderingContextBase.
Update IDL code for WebGLObject creation methods to match the interface.

Author: envia

specs/latest/2.0/index.html

@@ -2636,7 +2636,7 @@ <h4>Query objects</h4>
 
     <dl class="methods">
       <dt>
-        <p class="idl-code">WebGLQuery? createQuery()
+        <p class="idl-code">WebGLQuery createQuery()
           <span class="gl-spec">
             (<a href="https://www.khronos.org/registry/OpenGL/specs/es/3.0/es_spec_3.0.pdf#nameddest=section.2.14">OpenGL ES 3.0.6 &sect;2.14</a>,
             <a href="http://www.khronos.org/opengles/sdk/docs/man3/html/glGenQueries.xhtml" class="nonnormative">man page</a>)
@@ -2794,7 +2794,7 @@ <h4>Sampler objects</h4>
 
     <dl class="methods">
       <dt>
-        <p class="idl-code">WebGLSampler? createSampler()
+        <p class="idl-code">WebGLSampler createSampler()
           <span class="gl-spec">
             (<a href="https://www.khronos.org/registry/OpenGL/specs/es/3.0/es_spec_3.0.pdf#nameddest=subsection.3.8.2">OpenGL ES 3.0.6 &sect;3.8.2</a>,
             <a href="http://www.khronos.org/opengles/sdk/docs/man3/html/glGenSamplers.xhtml" class="nonnormative">man page</a>)
@@ -3108,7 +3108,7 @@ <h4>Transform feedback</h4>
     </p>
 
     <dl class="methods">
-        <dt class="idl-code">WebGLTransformFeedback? createTransformFeedback()
+        <dt class="idl-code">WebGLTransformFeedback createTransformFeedback()
             <span class="gl-spec">
               (<a href="https://www.khronos.org/registry/OpenGL/specs/es/3.0/es_spec_3.0.pdf#nameddest=subsection.2.15.1">OpenGL ES 3.0.6 &sect;2.15.1</a>,
               similar to <a class="nonnormative" href="http://www.khronos.org/opengles/sdk/docs/man3/html/glGenTransformFeedbacks.xhtml">glGenTransformFeedbacks</a>)
@@ -3372,7 +3372,7 @@ <h4>Vertex Array objects</h4>
             An attempt to bind a deleted vertex array will generate a <code>INVALID_OPERATION</code> error, and
             the current binding will remain untouched.
 
-        <dt class="idl-code">WebGLVertexArrayObject? createVertexArray()
+        <dt class="idl-code">WebGLVertexArrayObject createVertexArray()
             <span class="gl-spec">
               (<a href="https://www.khronos.org/registry/OpenGL/specs/es/3.0/es_spec_3.0.pdf#nameddest=section.2.11">OpenGL ES 3.0.6 &sect;2.11</a>,
               similar to <a class="nonnormative" href="https://www.khronos.org/opengles/sdk/docs/man3/html/glGenVertexArrays.xhtml">glGenVertexArrays</a>)

specs/latest/2.0/webgl2.idl

@@ -3,7 +3,7 @@
 // WebGL IDL definitions scraped from the Khronos specification:
 // https://www.khronos.org/registry/webgl/specs/latest/
 
-// Copyright (c) 2024 The Khronos Group Inc.
+// Copyright (c) 2025 The Khronos Group Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a
 // copy of this software and/or associated documentation files (the
@@ -445,7 +445,7 @@ interface mixin WebGL2RenderingContextBase
   undefined clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
 
   /* Query Objects */
-  WebGLQuery? createQuery();
+  WebGLQuery createQuery();
   undefined deleteQuery(WebGLQuery? query);
   [WebGLHandlesContextLoss] GLboolean isQuery(WebGLQuery? query);
   undefined beginQuery(GLenum target, WebGLQuery query);
@@ -454,7 +454,7 @@ interface mixin WebGL2RenderingContextBase
   any getQueryParameter(WebGLQuery query, GLenum pname);
 
   /* Sampler Objects */
-  WebGLSampler? createSampler();
+  WebGLSampler createSampler();
   undefined deleteSampler(WebGLSampler? sampler);
   [WebGLHandlesContextLoss] GLboolean isSampler(WebGLSampler? sampler);
   undefined bindSampler(GLuint unit, WebGLSampler? sampler);
@@ -471,7 +471,7 @@ interface mixin WebGL2RenderingContextBase
   any getSyncParameter(WebGLSync sync, GLenum pname);
 
   /* Transform Feedback */
-  WebGLTransformFeedback? createTransformFeedback();
+  WebGLTransformFeedback createTransformFeedback();
   undefined deleteTransformFeedback(WebGLTransformFeedback? tf);
   [WebGLHandlesContextLoss] GLboolean isTransformFeedback(WebGLTransformFeedback? tf);
   undefined bindTransformFeedback (GLenum target, WebGLTransformFeedback? tf);
@@ -494,7 +494,7 @@ interface mixin WebGL2RenderingContextBase
   undefined uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
 
   /* Vertex Array Objects */
-  WebGLVertexArrayObject? createVertexArray();
+  WebGLVertexArrayObject createVertexArray();
   undefined deleteVertexArray(WebGLVertexArrayObject? vertexArray);
   [WebGLHandlesContextLoss] GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
   undefined bindVertexArray(WebGLVertexArrayObject? array);