Add description for auto correction threshold strings

Bug: 3088802
Bug: 3091970
Change-Id: I6f0cdb9ec74824497ff5f9e3a2ca5d7d29de0dd7
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index a664aaf..f3805fd 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -72,9 +72,9 @@
     <string name="auto_correction_summary">Spacebar and punctuation automatically insert highlighted word</string>
     <!-- Option to disable auto correction. [CHAR LIMIT=20] -->
     <string name="auto_correction_threshold_mode_off">Off</string>
-    <!-- Option to use modest auto correction. [CHAR LIMIT=20] -->
+    <!-- Option to suggest auto correction candidates modestly. Auto-corrects only to a word which has small edit distance from typed word. [CHAR LIMIT=20] -->
     <string name="auto_correction_threshold_mode_modest">Modest</string>
-    <!-- Option to use aggressive auto correction. [CHAR LIMIT=20] -->
+    <!-- Option to suggest auto correction candidates aggressively. Auto-corrects to a word which has even large edit distance from typed word. [CHAR LIMIT=20] -->
     <string name="auto_correction_threshold_mode_aggeressive">Aggressive</string>
 
     <!-- Option to enable bigram correction -->