Fix grammar in ARM suh as was fixed in rndc manual.

This is prompted by ticket #37505 from chucka.

diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
index 1bdf2d3f27b6f831721c95bebcaef0aebf5c6ca0..e8ff4a4627971af728d41976a133b4a4882909b0 100644 (file)
--- a/doc/arm/Bv9ARM-book.xml
+++ b/doc/arm/Bv9ARM-book.xml
@@ -5723,7 +5723,7 @@ options {
                </para>
                <para>
                  A negative trust anchor selectively disables
-                 DNSSEC validation for zones that known to be
+                 DNSSEC validation for zones that are known to be
                  failing because of misconfiguration rather than
                  an attack.  When data to be validated is
                  at or below an active NTA (and above any other