Unicode: s/codepoint/code_point/g

Unicode calls them "code points" so let's follow their style.

Libraries/LibTextCodec/Decoder.cpp

@@ -65,8 +65,8 @@ String Latin1Decoder::to_utf8(const StringView& input)
     StringBuilder builder(input.length());
     for (size_t i = 0; i < input.length(); ++i) {
         u8 ch = input[i];
-        // Latin1 is the same as the first 256 Unicode codepoints, so no mapping is needed, just utf-8 encoding.
-        builder.append_codepoint(ch);
+        // Latin1 is the same as the first 256 Unicode code_pointss, so no mapping is needed, just utf-8 encoding.
+        builder.append_code_points(ch);
     }
     return builder.to_string();
 }