Tweak thin/unusual font note (remove the "we recommend", emphasise th…

…is is best practice only)

understanding/20/contrast-enhanced.html

@@ -66,8 +66,9 @@ <h2>Intent of Contrast (Enhanced)</h2>
          <p>Due to anti-aliasing, particularly thin or unusual fonts may be rendered by user agents with a much fainter
             color than the actual text color defined in the underlying CSS. This can lead to situations where text has
             a contrast ratio that nominally passes the Success Criterion, but has a much lower contrast in practice.
-            For these cases, we recommend as a best practice that authors choose a font with stronger/thicker lines,
-            or aim for a text color that exceeds the baseline requirements of this Success Criterion.
+            In these cases, best practice would be for authors to choose a font with stronger/thicker lines,
+            or to aim for a foreground/background color combination that exceeds the normative requirements of
+            this Success Criterion.
          </p>
       </div>
 

understanding/20/contrast-minimum.html

@@ -66,8 +66,9 @@ <h2>Intent of Contrast (Minimum)</h2>
          <p>Due to anti-aliasing, particularly thin or unusual fonts may be rendered by user agents with a much fainter
             color than the actual text color defined in the underlying CSS. This can lead to situations where text has
             a contrast ratio that nominally passes the Success Criterion, but has a much lower contrast in practice.
-            For these cases, we recommend as a best practice that authors choose a font with stronger/thicker lines,
-            or aim for a text color that exceeds the baseline requirements of this Success Criterion.
+            In these cases, best practice would be for authors to choose a font with stronger/thicker lines,
+            or to aim for a foreground/background color combination that exceeds the normative requirements
+            of this Success Criterion.
          </p>
       </div>