Update o3p06-format-punctuation.html

Text of “"Avoid the use of Roman Numerals and unfamiliar symbols in text were possible. " should be “..where possible”

Author: ehind67

design-guide/o3p06-format-punctuation.html

@@ -91,7 +91,7 @@ More Details
   p>
   <p>
     <strong>Avoid the use of Roman Numerals and unfamiliar symbolsstrong>
-    in text were possible. These can confuse readers and are likely to be read
+    in text where possible. These can confuse readers and are likely to be read
     incorrectly by text-to-speech tools. If these symbols are necessary then
     ensure they are marked up correctly, using techniques such as MathML and
     abbreviation expansions to provide additional support. Roman Numerals should