Add NEWS entry for #9841

Closes GH-9841

Author: kamil-tekiela

NEWS

@@ -15,6 +15,10 @@ PHP                                                                        NEWS
   . Fixed bug GH-9763 (DateTimeZone ctr mishandles input and adds null byte if
     the argument is an offset larger than 100*60 minutes). (Derick)
 
+- mysqli:
+  . Fixed bug GH-9841 (mysqli_query throws warning despite using
+    silenced error mode). (Kamil Tekiela)
+
 - OpenSSL:
   . Fixed bug GH-8430 (OpenSSL compiled with no-md2, no-md4 or no-rmd160 does
     not build). (Jakub Zelenka, fsbruva)