docs: use scm_web for auto-instrumentation and sqlcommenter examples (#5428)

* docs: add scm_web link to auto-instrumentation example

* docs: replace raw GitHub URL with scm_web in sqlcommenter example

* docs: move scm_web link inline over 'directory' in auto-instrumentation

* docs: add scm_web links to error_handler_0 and error_handler_1 stubs

* docs: add title and scm_web links to flask-gunicorn and flask-uwsgi stubs

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Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>