Fix links to examples in docs

I noticed some links to examples were broken in the docs. This attempts
to fix that.

Tracy Atteberry (1):
  docs: fix path ../examples -> ../../examples is subdirectory docs

doc/concepts/application_architecture.md | 4 +-
doc/concepts/application_testing.md | 2 +-
doc/concepts/custom_widgets.md | 4 +-
doc/getting_started/quickstart.md | 82 ++++++++++++------------
4 files changed, 46 insertions(+), 46 deletions(-)

ratatui_ruby/patches: FAILED in 6m27s

[Fix links to examples in docs][0] from [~grymoire][1]

[0]: https://lists.sr.ht/~kerrick/ratatui_ruby-devel/patches/66152
[1]: mailto:grymoire@git.sr.ht

#1652450 SUCCESS ratatui_ruby/patches/ruby-3.4.yml https://builds.sr.ht/~kerrick/job/1652450
#1652449 FAILED ratatui_ruby/patches/ruby-3.3.yml https://builds.sr.ht/~kerrick/job/1652449
#1652448 SUCCESS ratatui_ruby/patches/ruby-3.2.yml https://builds.sr.ht/~kerrick/job/1652448
#1652451 SUCCESS ratatui_ruby/patches/ruby-4.0.0.yml https://builds.sr.ht/~kerrick/job/1652451

Hello,

Thank you for submitting the project's first patch!
I have applied it and pushed it to the trunk branch.