gallium/docs: clarify render_condition_enabled parameter to clear functions
gallium/docs: clarify render_condition_enabled parameter to clear functions

If false, it means do the clear unconditionally.

Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler