Add missing comma in introduction.rst

[bartolomeomueller]

Hey,
I just stumbled upon this sentence in the docu and needed to read it three times to get what it's saying. I think there is a comma missing, but I am not a native speaker, so please double check it.

[ansible-documentation-bot]

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[ansible-documentation-bot]

Thanks for your contribution, @bartolomeomueller! Please make sure that your pull request includes sufficient and meaningful details in the description.
PR descriptions provide important context and allow other developers and our future selves to understand a change's rationale and what it actually fixes or accomplishes.

[felixfontein]

I think this is correct (but then, I'm also not a native English speaker ;) ). It definitely makes the sentence easier to parse though IMO.

[samccann]

Thanks @bartolomeomueller ! This does make the sentence easier to read.

[patchback]

Backport to stable-2.17: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2.17/aad8488440321ef5722f6a8d2b6a15f7179bf7fb/pr-2914

Backported as #2919

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to stable-2.18: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2.18/aad8488440321ef5722f6a8d2b6a15f7179bf7fb/pr-2914

Backported as #2920

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to stable-2.19: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2.19/aad8488440321ef5722f6a8d2b6a15f7179bf7fb/pr-2914

Backported as #2921

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.