Update subtext of Ethernet Tethering preference

Update the subtext summary according to UX

Bug: 153761463
Test: built successfully; manually test
Change-Id: I96d1a1f5111f85ee4b10f61ab4408822b99032e1
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 44ad44d..629394a 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -3870,7 +3870,7 @@
     <!-- Label for ethernet tether checkbox [CHAR LIMIT=NONE]-->
     <string name="ethernet_tether_checkbox_text">Ethernet tethering</string>
     <!-- Ethernet Tethering subtext [CHAR LIMIT=NONE]-->
-    <string name="ethernet_tethering_subtext" product="default">Share phone\u2019s internet connection via USB Ethernet</string>
+    <string name="ethernet_tethering_subtext" product="default">Share phone\u2019s internet connection via Ethernet</string>
 
     <!-- Tethering footer info [CHAR LIMIT=NONE]-->
     <string name="tethering_footer_info">Use hotspot and tethering to provide internet to other devices through your mobile data connection. Apps can also create a hotspot to share content with nearby devices.</string>