Correct an "is is" occurrence in a sentence.

Found by: find /my/local/en_US.ISO8859-1/doc/dir | xargs grep " is is "
svn path=/head/; revision=36045
2010-07-18 11:27:51 +00:00 · 2010-07-18 11:27:51 +00:00 · 88255c8034 · 2020-12-08 03:00:23 +00:00
commit 88255c8034
parent c5c34c6c83
1 changed files with 1 additions and 1 deletions
--- a/en_US.ISO8859-1/books/faq/book.sgml
+++ b/en_US.ISO8859-1/books/faq/book.sgml
@ -4528,7 +4528,7 @@ kern.timecounter.hardware: TSC -&gt; i8254</screen>
 	    one should be able to refuse categories, but in practice
 	    there are too many ports that depend on ports in other
 	    categories.  Until someone comes up with a solution for this
-	    problem, the general rule is is that if you want to build
+	    problem, the general rule is that if you want to build
 	    <filename>INDEX</filename>, you must have a complete copy of
 	    the Ports Collection.</para>