update verbiage in NEWS bullet

NEWS.md

@@ -1,9 +1,9 @@
 # dbplyr (development version)
 
-* Tightened argument checks for Snowflake SQL translations. These changes should 
-  result in more informative errors in cases where code already failed; if you
-  see errors with code that used to run without issue, please report them to
-  the package authors (@simonpcouch, #1554).
+* Tightened argument checks for SQL translations. These changes should 
+  result in more informative errors in cases where code already failed, possibly
+  silently; if you see errors with code that used to run correctly, please report 
+  them to the package authors (@simonpcouch, #1554, #1555).
 
 * `clock::add_years()` translates to correct SQL on Spark (@ablack3, #1510).