Add docs for setSignalStrengthReportingCriteria

Because setSignalStrengthReportingCriteria only
supports a single measurement quantity, provide
further clarification on the applicability of the
API and how it may be used in various situations.

Bug: 110121199
Test: compilation - docstring-only change
Change-Id: If4236070fbc03368e5a78b0cf502cdc4a529a6ed
diff --git a/current.txt b/current.txt
index 978f6c6..5fa0337 100644
--- a/current.txt
+++ b/current.txt
@@ -385,3 +385,4 @@
 574e8f1499436fb4075894dcae0b36682427956ecb114f17f1fe22d116a83c6b android.hardware.neuralnetworks@1.0::IPreparedModel
 1a5ae9793223658174258b523763c557abad6fb917df0b8e3cc097fc89035811 android.hardware.neuralnetworks@1.0::types
 4310eb8272f085914952f3bfb73a8f8bb477a80e8b93596f0ea5acb58546b66d android.hardware.neuralnetworks@1.1::types
+1d19720d4fd38b1095f0f555a4bd92b3b12c9b1d0f560b0e9a474cd6dcc20db6 android.hardware.radio@1.2::IRadio