(DOCSP-36170): Updated stem sentence guidance. (#166)

* (DOCSP-36170): Updated stem sentence guidance.

* (DOCSP-36170): Incorporated feedback.

* (DOCSP-36170): Incorporated Chris's feedback.

Author: corryroot

source/style-guide/style/lists.txt

@@ -39,8 +39,16 @@ guidelines when introducing lists.
        period instead of a colon.
 
        .. note::
-          Avoid using fragments to introduce lists. Fragments can be
-          harder to understand than sentences.
+
+          Avoid using a fragment to introduce a list. Users might 
+          find a fragment more difficult to understand than a full 
+          sentence. If a full sentence makes the introduction awkward 
+          or redundant, use a sentence stem to introduce the list and 
+          ensure the list items complete the sentence. Consider 
+          accessibility and screen readers because introductory text 
+          plays a crucial role in providing context and navigation cues 
+          for individuals who rely on auditory output. To learn more, 
+          see `Section508 <https://www.section508.gov/>`__.
 
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