Clarify example snippets a bit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143224 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ProgrammersManual.html b/docs/ProgrammersManual.html
index 4460224..2cdcd27 100644
--- a/docs/ProgrammersManual.html
+++ b/docs/ProgrammersManual.html
@@ -998,7 +998,7 @@
 <pre>
 for ( ... ) {
    std::vector&lt;foo&gt; V;
-   use V;
+   // make use of V.
 }
 </pre>
 </div>
@@ -1009,7 +1009,7 @@
 <pre>
 std::vector&lt;foo&gt; V;
 for ( ... ) {
-   use V;
+   // make use of V.
    V.clear();
 }
 </pre>