Update entry for uninitMemberVarNoCtor in releasenotes.txt (#8585) [skip ci]

Author: chrchr-github

releasenotes.txt

@@ -7,7 +7,7 @@ Major bug fixes & crashes:
 New checks:
 - MISRA C 2012 rule 10.3 now warns on assigning integer literals 0 and 1 to bool in C99 and later while preserving the existing C89 behavior.
 - funcArgNamesDifferentUnnamed warns on function declarations/definitions where a parameter in either location is unnamed
-- uninitMemberVarNoCtor warns on user-defined types where some but not all members requiring initialization have in-class initializers.
+- uninitMemberVarNoCtor warns on user-defined types where (1) some but not all members requiring initialization have in-class initializers or (2) there is a mixture of members which do/do not require initialization.
 - fcloseInLoopCondition warns when fclose() is used as a while loop condition, which may skip the loop body or double-close the file handle.
 
 C/C++ support: