Codechange: remove duplicate and out-of-date documentation for LoadFont (#15411)

Move comments inline to code where useful.

src/fontcache/freetypefontcache.cpp

@@ -220,15 +220,6 @@ public:
 		_ft_library = nullptr;
 	}
 
-	/**
-	 * Loads the freetype font.
-	 * First try to load the fontname as if it were a path. If that fails,
-	 * try to resolve the filename of the font using fontconfig, where the
-	 * format is 'font family name' or 'font family name, font style'.
-	 * @param fs The font size to load.
-	 * @param fonttype The type of font that is requested to be loaded.
-	 * @return The loaded font, or \c nullptr when none could be loaded.
-	 */
 	std::unique_ptr<FontCache> LoadFont(FontSize fs, FontType fonttype) const override
 	{
 		if (fonttype != FontType::TrueType) return nullptr;