#time-offset-with-frames should be called #time-clock-with-frames

[nigelmegitt]

In each of the following (non-normative) sections:

• IMSC 1.0.1 note at the bottom of §6.11,
• IMSC 1.1 §7.2.12 #time-offset-with-frames,
• IMSC 1.2 §8.2.12 #time-offset-with-frames

there is an explanation of how to convert a time expression with frames to a media time, but what is described is conversion of a clock time with frames, not an offset time.

The labelling as #time-offset-with-frames should be changed to #time-clock-with-frames.