[webgl2] Web IDL validation errors

[autokagami]

🤖 This is an automatic issue report for Web IDL validation error. 🤖

The bot found validation errors but couldn't fix them automatically, since the IDL texts include HTML tags. Please check the following messages and fix them.

• Validation error at line 458 in webgl2,6:
   target, [AllowShared] BufferSource? srcData, GLenum
                         ^
  

  Error: [AllowShared] BufferSource is now replaced with AllowSharedBufferSource.

• Validation error at line 459 in webgl2,6:
   dstByteOffset, [AllowShared] BufferSource srcData);
                                ^
  

  Error: [AllowShared] BufferSource is now replaced with AllowSharedBufferSource.

Please file an issue at https://github.com/saschanaz/webidl-updater/issues/new if you think this is invalid or should be enhanced.

[kdashg]

This is #3539!