Update documentation according API review

Bug: 174580495, 174580077
Change-Id: I2791eb1351057a55caa99e9e1b95d26a31d708f2
Test: build
diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index dc2e7a7..86a8e99 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -10179,7 +10179,7 @@
     method @NonNull @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public android.telephony.PinResult setIccLockEnabled(boolean, @NonNull String);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setMobileDataPolicyEnabledStatus(int, boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setMultiSimCarrierRestriction(boolean);
-    method public int setNrDualConnectivityState(int);
+    method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int setNrDualConnectivityState(int);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean setOpportunisticNetworkState(boolean);
     method @Deprecated @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean setPreferredNetworkTypeBitmask(long);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean setRadio(boolean);
diff --git a/telephony/java/android/telephony/CarrierBandwidth.java b/telephony/java/android/telephony/CarrierBandwidth.java
index b153fef..9e1dee0 100644
--- a/telephony/java/android/telephony/CarrierBandwidth.java
+++ b/telephony/java/android/telephony/CarrierBandwidth.java
@@ -101,7 +101,7 @@
     }
 
     /**
-     * Retrieves the upstream bandwidth for the primary network in Kbps.  This always only refers to
+     * Retrieves the upstream bandwidth for the primary network in kbps.  This always only refers to
      * the estimated first hop transport bandwidth.
      * This will be {@link #INVALID} if the network is not connected
      *
@@ -112,7 +112,7 @@
     }
 
     /**
-     * Retrieves the downstream bandwidth for the primary network in Kbps.  This always only refers
+     * Retrieves the downstream bandwidth for the primary network in kbps.  This always only refers
      * to the estimated first hop transport bandwidth.
      * This will be {@link #INVALID} if the network is not connected
      *
@@ -123,7 +123,7 @@
     }
 
     /**
-     * Retrieves the upstream bandwidth for the secondary network in Kbps.  This always only refers
+     * Retrieves the upstream bandwidth for the secondary network in kbps.  This always only refers
      * to the estimated first hop transport bandwidth.
      * <p/>
      * This will be {@link #INVALID} if either are the case:
@@ -143,7 +143,7 @@
     }
 
     /**
-     * Retrieves the downstream bandwidth for the secondary network in Kbps.  This always only
+     * Retrieves the downstream bandwidth for the secondary network in kbps.  This always only
      * refers to the estimated first hop transport bandwidth.
      * <p/>
      * This will be {@link #INVALID} if either are the case:
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index e3853fa..23dcee6 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -14120,12 +14120,11 @@
      * {@link #NR_DUAL_CONNECTIVITY_DISABLE_IMMEDIATE}
      * </ol>
      * @return operation result.
-     * <p>Requires Permission:
-     * {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}
      * @throws IllegalStateException if the Telephony process is not currently available.
      * @hide
      */
     @SystemApi
+    @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
     public @EnableNrDualConnectivityResult int setNrDualConnectivityState(
             @NrDualConnectivityState int nrDualConnectivityState) {
         try {