META: Improve Drupal 10 porting documentation

Note for the anti-gaming tips, having a clearer issue summary as to what to do for testing and what shouldn't be added as screenshots might be a good way to go.

From @gambry in Slack:

It was well prepared and organised. It’s clear we’ve all improved.

The only comment I have to make is documentation got harder and harder while getting closer to the event. From two original documentation pages back in July, now we have five of them.

Also the pages are interlinked. For example to understand how to setup locally you go:

1. Setting up Drupal 9 and Drupal 10 development environments
2. which at the end then links to Getting started at Drupal 10 Global Porting Day#contribution paths
3. where you can chose either Manually testing Drupal 10 compatibility patches or Creating or updating compatibility patches with Composer and DDev

Due last minutes additions, some paragraphs don’t make much sense and are confused, i.e. Create/Update Drupal 10 compatibility patch sections reads ” Just press the “Create issue fork”" without context where this button is, “Drupal.org provides two ways:” and there are 3 bullet points.

Not a complaint, just an observation D.org documentation tends to get too complex then it needs.

I’m a big advisor of “less is more”, providing ONE way for doing stuff and a “Read More” list of links at the bottom for advanced users. We won’t cover all our beautiful processes diversity, but contributors will get up and running faster.

Again, not a complaint, just an observation if many feels the same way.

Said that, wonderful job everyone!

Add event page example to summary.

We should update the bot issue summary per https://www.drupal.org/project/bootstrap4/issues/3296669#comment-14709997. I did make a core issue that I'll have to dig up.

Another "looks like gaming" example: https://www.drupal.org/project/review_date/issues/3297973#comment-14710008

Update summary list.

Some amazing thoughts here from @mmjvb:

https://www.drupal.org/project/icontact_integration/issues/3297388#comme...

Update improvement list.