Add opnd_is_vector_base_disp() to release.dox

api/docs/release.dox

@@ -212,6 +212,8 @@ Further non-compatibility-affecting changes include:
    #dynamorio::drmemtrace::analysis_tool_t to allow the tool to make holistic
    adjustments to the interval snapshots after all have been generated, and before
    they are used for merging across shards (potentially), and printing the results.
+ - Added opnd_is_vector_base_disp() to test if an opnd_t is a base+disp memory operand
+   that uses a vector register for the base or index register.
 
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