Symfony: Explain how to ignore some exceptions

[alexislefebvre]

I took the code from the package and adapted it.

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Name	Status	Preview	Updated
sentry-docs	✅ Ready (Inspect)	Visit Preview	Oct 5, 2022 at 3:40PM (UTC)

[cleptric]

I'll look at this next week, thanks @imatwawana and @alexislefebvre