Fix simple example docs links

[PebbleKat]

No description provided.

[HBehrens]

I ran $ linkchecker --ignore-url "\.(css|svg|eot|ttf|woff.)(#.*)?" --check-extern http://localhost:8000 with your changes applied and found a one other problem:

URL        `https://developer.pebble.com/docs/c/Foundation/AppSyn/'
Name       `AppSync'
Parent URL http://localhost:8000/docs/, line 114, col 13
Real URL   https://developer.pebble.com/docs/c/Foundation/AppSyn/
Check time 2.802 seconds
Size       8KB
Result     Error: 404 Not Found

can you fix this as part of this PR as well?

[PebbleKat]

@HBehrens fixed the mentioned link as well.

[HBehrens]

Thank you!