Improve wording of documentation of Duplicate Sequences module

Help/3 Analysis Modules/8 Duplicate Sequences.html

@@ -13,9 +13,9 @@ <h1>Duplicate Sequences</h1>
 <h2>Summary</h2>
 <p>
 In a diverse library most sequences will occur only once in the final
-set.  A low level of duplication may indicate a very high level of 
-coverage of the target sequence, but a high level of duplication is
-more likely to indicate some kind of enrichment bias (eg PCR over
+set. A slightly elevated level of duplication may indicate a very high
+level of coverage of the target sequence, but a high level of duplication
+is more likely to indicate some kind of enrichment bias (eg PCR over
 amplification).
 </p>
 <p>