Repair cut-and-paste typo which described createdb rather than destroydb.

Thomas G. Lockhart · Thomas G. Lockhart · commit 107eb78fd45f · 1999-03-30T15:24:49.000Z
diff --git a/doc/src/sgml/ref/destroydb.sgml b/doc/src/sgml/ref/destroydb.sgml
@@ -10,7 +10,7 @@
 <application>destroydb</application>
 </REFNAME>
 <REFPURPOSE>
-Create a new <productname>Postgres</productname> database
+Remove an existing <productname>Postgres</productname> database
 </REFPURPOSE>
   </refnamediv>
 <REFSYNOPSISDIV>
