thirdPartyErrorIntegration should take behavior, not behaviour

[szokeasaurusrex]

Description

The behavior of the thirdPartyErrorIntegration is currently defined by a parameter spelled behaviour, which is the British English spelling of the American English word "behavior" (without a "u").

Since Sentry prefers to use American English spelling in our documentation, and hence, also in public-facing APIs, we should change the name of this parameter to behavior. We can keep behaviour around as a deprecated alias to behavior for backwards-compatibility.

After correcting the spelling, we also need to update the example on this docs page to use the corrected spelling.

[lforst]

Hi, I messed this up but we'll likely not change it as all it does is increase bundle size with basically 0 user gain.

[szokeasaurusrex]

Fair enough