Update getExtensionX HAL docs

Test: hidl-gen -Lcheck android.hardware.gnss@2.1
Bug:147614118
Change-Id: Icc2453847519e449f753dc68bedc00c1c92e6744
diff --git a/current.txt b/current.txt
index f6659e3..d4a1e87 100644
--- a/current.txt
+++ b/current.txt
@@ -648,7 +648,7 @@
 446287268831f4ddfac4a51bb1c32ae1e48e47bccd535fccc2c4546d0e7c4013 android.hardware.dumpstate@1.1::types
 f284ffde7cadf5a1364b75ab313baf22401eeca289bdde2a2dc7a27ea4ab98d7 android.hardware.dumpstate@1.1::IDumpstateDevice
 769d346927a94fd40ee80a5a976d8d15cf022ef99c5900738f4a82f26c0ed229 android.hardware.gnss@2.1::types
-626db710bf917ecf551a0b0b1f25be10bf52758f43e0fc808b148b6aae2ef73e android.hardware.gnss@2.1::IGnss
+c319e68b03829958404402c2d9c682019678087d60495807c0a7444e0a6af981 android.hardware.gnss@2.1::IGnss
 ba5ac712b2a656dc07c83ab4a7a2c2f3bee1bbcb752e8b8ffa9b672f3b5b0728 android.hardware.gnss@2.1::IGnssAntennaInfo
 0bc3ed97cbc3f6abc89c68f4e9f4d124f9f723431997dc88c2186cf4d2ad47ee android.hardware.gnss@2.1::IGnssAntennaInfoCallback
 50c5d009af76d65b3023a9d94ee519545e72cb7c59bc7166d768d6f00923774d android.hardware.gnss@2.1::IGnssCallback
diff --git a/gnss/2.1/IGnss.hal b/gnss/2.1/IGnss.hal
index e4da507..a880b3f 100644
--- a/gnss/2.1/IGnss.hal
+++ b/gnss/2.1/IGnss.hal
@@ -45,9 +45,9 @@
     /**
      * This method returns the IGnssMeasurement interface.
      *
-     * At least one of getExtensionGnssMeasurement(), getExtensionGnssMeasurement_1_1(),
+     * getExtensionGnssMeasurement(), getExtensionGnssMeasurement_1_1(),
      * getExtensionGnssMeasurement_2_0(), and getExtensionGnssMeasurement_2_1() methods must return
-     * a non-null handle, and the other methods must return nullptr.
+     * non-null. They can all return the same, latest version of IGnssMeasurement.
      *
      * @return gnssMeasurementIface Handle to the IGnssMeasurement interface.
      */
@@ -56,9 +56,9 @@
     /**
      * This method returns the IGnssConfiguration interface.
      *
-     * At least one of getExtensionGnssConfiguration(), getExtensionGnssConfiguration_1_1(),
+     * getExtensionGnssConfiguration(), getExtensionGnssConfiguration_1_1(),
      * getExtensionGnssConfiguration_2_0(), and getExtensionGnssConfiguration_2_1() methods must
-     * return a non-null handle, and the other methods must return nullptr.
+     * return non-null. They can all return the same, latest version of IGnssConfiguration.
      *
      * @return gnssConfigurationIface Handle to the IGnssConfiguration interface.
      */