Wifi: Improve documentation for some hidl APIs

This commit improves some of the comments for the Wifi Hidl APIs.

Bug: 148236141
Test: No test is done
Change-Id: Iff6b191c8b258615ddaacad570b81f0ada968ed4
diff --git a/current.txt b/current.txt
index 74c0cbb..898a298 100644
--- a/current.txt
+++ b/current.txt
@@ -600,6 +600,8 @@
 a785a57447a81e9c130eef6904c3a5c256076c6a04588c40620ebd6fa2660d77 android.hardware.radio@1.2::types
 1a6e2bd289f22931c526b21916910f1d4c436b7acb9556e4243de4ce8e6cc2e4 android.hardware.soundtrigger@2.0::ISoundTriggerHwCallback
 fd65298e1e09e0e3c781ab18305920d757dbe55a3b459ce17814ec5cf6dfee99 android.hardware.wifi@1.0::IWifiP2pIface
+ff5dd821c2c7a9c78607159c4d788960b725487263c49d956ca5fa3d37008b45 android.hardware.wifi@1.2::IWifiStaIface
+5751f230e86a36111e7c5b995577cbf89d8df76c8e6c7641199198f3db3a93f7 android.hardware.wifi@1.3::IWifiStaIface
 
 # HALs released in Android R
 e966a3437d6a98d9d9e14e9d672088771716031900c0deb55a0946c751a03a44 android.hardware.audio@6.0::types
diff --git a/wifi/1.2/IWifiStaIface.hal b/wifi/1.2/IWifiStaIface.hal
index 3a7f777..d65b33b 100644
--- a/wifi/1.2/IWifiStaIface.hal
+++ b/wifi/1.2/IWifiStaIface.hal
@@ -23,7 +23,7 @@
 /**
  * Interface used to represent a single STA iface.
  *
- * IWifiChip.createStaIface() may return a @1.2::IWifiStaIface when supported.
+ * IWifiChip.createStaIface() must return a @1.2::IWifiStaIface when supported.
  */
 interface IWifiStaIface extends @1.0::IWifiStaIface {
     /**
diff --git a/wifi/1.3/IWifiStaIface.hal b/wifi/1.3/IWifiStaIface.hal
index 81c0c38..3a75509 100644
--- a/wifi/1.3/IWifiStaIface.hal
+++ b/wifi/1.3/IWifiStaIface.hal
@@ -23,7 +23,7 @@
 /**
  * Interface used to represent a single STA iface.
  *
- * IWifiChip.createStaIface() may return a @1.3::IWifiStaIface when supported.
+ * IWifiChip.createStaIface() must return a @1.3::IWifiStaIface when supported.
  */
 interface IWifiStaIface extends @1.2::IWifiStaIface {
     /**