The instructions are letter perfect. There is a typo in your registry, maybe a space in "Wave Editor" (wrong) instead of "WaveEditor" (right) if I were guessing
Here are my registry entries in export format (your SF path may be different):
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Tools Menu\Sound Forge]
"ExePath"="C:\\Program Files (x86)\\Sony\\Sound Forge Pro 10.0\\Forge100.exe"
"MenuText"="&Sound Forge"
"StatusBarText"="Run Sound Forge"
"Type"="WaveEditor"