fix(feedback): Clarify the difference between createWidget and create Form in the feedback public api

[ryan953]

Prior to this PR it was only possible to get the floating feedback button if you configured autoInject: true.

In our uses on sentry.io we want to be able to show that button on some pages, but not others. This make it possible, the (react hooks) code to do that is:

useEffect(() => {
  const widget = feedback.createWidget(options);
  return async () => {
    widget.removeFromDom();
  };
}, []);

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.64 KB (0%)
@sentry/browser (incl. Tracing)	32.68 KB (0%)
@sentry/browser (incl. Tracing, Replay)	68.03 KB (0%)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.43 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.07 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.21 KB (-0.08% 🔽)
@sentry/browser (incl. Feedback)	37.77 KB (-0.04% 🔽)
@sentry/browser (incl. sendFeedback)	26.43 KB (+0.01% 🔺)
@sentry/browser (incl. FeedbackAsync)	30.9 KB (-0.11% 🔽)
@sentry/react	24.33 KB (0%)
@sentry/react (incl. Tracing)	35.64 KB (0%)
@sentry/vue	25.47 KB (0%)
@sentry/vue (incl. Tracing)	34.47 KB (0%)
@sentry/svelte	21.77 KB (0%)
CDN Bundle	23.95 KB (0%)
CDN Bundle (incl. Tracing)	33.98 KB (0%)
CDN Bundle (incl. Tracing, Replay)	67.67 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	83.58 KB (+0.04% 🔺)
CDN Bundle - uncompressed	70.58 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	100.94 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	210.55 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	257.02 KB (+0.04% 🔺)
@sentry/nextjs (client)	34.86 KB (0%)
@sentry/sveltekit (client)	33.24 KB (0%)
@sentry/node	138.47 KB (0%)