trivial: format lists in TelephonyManager API doc

One of the docs updated is actually hidden, and another one
deprecated, but changing all for consistency.

Also fixed the "Returns 0" description to avoid a double-negation.

Bug: None
Test: CQ
Flag: DOCS_ONLY
Change-Id: I010d79c0eaa3a2068c3236971bf1d07db796ab3d