docs(bash): document fd3 debug output in bats tests

[testcara]

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Improvements for #744

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[testcara]

Hi, @glennj , thank you for the review. Comments look great. I have resolved all of them. Now the docs is shown as below:

Thank you for your continuous help.

[glennj]

Since redirecting to fd 3 seems to break tests on the test runner, is it worthwhile to mention that this only works for testing locally (not in the online editor)? @IsaacG what do you think?

[testcara]

Now, it is shown as below:

@glennj thank you for your continuous help. BTW, i added one note at the end to mention it just works locally. :-)

[glennj]

Let's stick with the Exercism style of notes. Please see https://exercism.org/docs/building/markdown/markdown#h-special-blocks-sometimes-called-admonitions

We might use exercism/caution for this.

[testcara]

Updated. and put it under the 'Debugging output' header for better user experience. Thank you, Glenn.

[glennj]

Thanks @testcara !

[testcara]

NP, It’s truly my honor to have the opportunity to contribute here. :-)