Feat: Add Format Content Example in Format Page

[AshinZ]

First of all, I think this is a very good project and this is very helpful when we do format change, especially now that the format has not been standardized yet. Now OTEL community are trying to introduce profiling model, see OTEL

When i read format page, i don't know what does it mean. For example, when i read perf script, if i don't know what does it mean clearly, i will try to read perf script doc or do a test to know what does perf script format mean. Also, for different people, there will be different name for a same format. So maybe we can add a format content example in format page.