Minor typo fixing and editing for osd_shader_interface.
Minor typo fixing and editing for osd_shader_interface.

c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,c64kernal/OpenSubdiv,anshuarya/OpenSubdiv,xldeveloper/OpenSubdiv,xldeveloper/OpenSubdiv,anshuarya/OpenSubdiv,anshuarya/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,takahito-tejima/OpenSubdiv,c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv