[backport ign-math6] Added examples to tutorials.md.in

[ahcorde]

🦟 Bug fix

Summary

Fixed tutorial index

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[chapulina]

I don't see these tutorials in ign-math6:

https://github.com/ignitionrobotics/ign-math/tree/ign-math6/tutorials

Did you forget to add the files?

[chapulina]

LGTM! I pushed some minor changes in 8d49702:

• Added \page to the top of each page, so the links from the main tutorials page work
• Changed branch master to ign-math6 on each tutorial
• Renamed the tutorials so they don't have example in their URLs, which makes them easier to find

[codecov]

Codecov Report

Merging #249 (8d49702) into ign-math6 (a4d0b1f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #249   +/-   ##
==========================================
  Coverage      99.41%   99.41%           
==========================================
  Files             67       67           
  Lines           6374     6374           
==========================================
  Hits            6337     6337           
  Misses            37       37           

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[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-03-01-citadel-edifice-fortress/1313/1