func comments: broken if comment already contains formatter directive

[gucio321]

// raw text without formatting. Roughly equivalent to Text("TextUnformattedV", text) but: A) doesn't require null terminated string if 'text_end' is specified, B) it's faster, no memory copy is done, no buffer size limits, recommended for
// %s parameter default value hint:
func TextUnformattedV(text string) {