docs: add notes section to time/quarter-of-year

PR-URL: #12734
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: Planeshifter

lib/node_modules/@stdlib/time/quarter-of-year/README.md

@@ -66,6 +66,16 @@ q = quarterOfYear( 'apr' );
 
 <!-- /.usage -->
 
+<section class="notes">
+
+## Notes
+
+-   The function's return value is a generalization and does **not** take into account inaccuracies due to daylight savings conventions, crossing timezones, or other complications with time and dates.
+
+</section>
+
+<!-- /.notes -->
+
 <section class="examples">
 
 ## Examples