add example for contractions

Author: shuangela

source/style-guide/style/product-names-version-numbers.txt

@@ -80,9 +80,7 @@ the following guidelines:
 
    * - Don't use MongoDB names as part of a contraction.
 
-     - Besides the high chance that such a contraction would use
-       passive voice, this diminishes the trademark and could add
-       ambiguity.
+     - Don't write *MongoDB's available*, but *MongoDB is available*.
 
    * - Use full, three-digit version numbers when referring to a
        specific release or feature. Use the two-digit release series