Rework the custom targets sharesheet snippet

[hamen]

Reworks the android_provide_custom_targets snippet used by the "Add custom targets" section of https://developer.android.com/develop/ui/compose/sharing/send#adding-custom-targets.

The snippet on the page builds two ChooserTarget instances and passes them through EXTRA_CHOOSER_TARGETS. ChooserTarget has been deprecated since API level 30, and its documentation points to Direct Share targets instead. The section it illustrates is about EXTRA_INITIAL_INTENTS, so the ChooserTarget part was not needed to make the point.

What changed:

• Removed the two ChooserTarget instances and the EXTRA_CHOOSER_TARGETS extra, along with the now unused ChooserTarget import.
• Removed the double Intent.createChooser call. The old code wrapped an already-created chooser in a second chooser, which is not what the guide describes.
• Reduced the initial intents from two to one, and gave it a name that reads as an example (CustomActivity) rather than pointing at Nearby Share and Maps.
• Moved the region tags so the snippet shows only the chooser construction.

This deviates from the current page text, which still shows the ChooserTarget version. The page needs the same update.

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• compose/snippets/src/main/java/com/example/compose/snippets/sharesheet/SharesheetSnippets.kt:178, tag android_provide_custom_targets

You are about to delete 1 region tag.

• compose/snippets/src/main/java/com/example/compose/snippets/sharesheet/SharesheetSnippets.kt:203, tag android_provide_custom_targets

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