[DOC] Advertise nilearn's in built globbing

[man-shu]

• Closes Globbing should be advertised in doc/examples. #810

Changes proposed in this pull request:

• add a section in this example about globbing

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.07%. Comparing base (abb80ff) to head (7f85600).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4334      +/-   ##
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  Files         144      143       -1     
  Lines       16419    16496      +77     
  Branches     3434     3463      +29     
==========================================
+ Hits        15082    15189     +107     
+ Misses        792      764      -28     
+ Partials      545      543       -2     

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[man-shu]

Just for the record, I ended up using different example and dataset than what I previously mentioned in the related issue #810

[bthirion]

Looks great ! Thx

[Remi-Gau]

good with me!!!

thanks