docs: Cherrypicking GetPhoneNumber docs fix to tm-dev

CPing the fix to tm-dev (where the docs builds come from) so it'll go live.


Merge "Update documentation to GetPhoneNumber with the security/privacy concerns" am: d1450e4e am: ce9e379a am: 9d1eb6ac

Bug: 235143721

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2241332

Change-Id: I1ada77b875c64901cc02a1e42712ae3f1ee19499

(cherry picked from commit 6bf945d2)
Test: [go/abtd docs build]

Change-Id: Ida22e156c380cdd8f1d88a2ac22fc014517fdb5f