Fix typo in recent doc updates

	* doc/xml/manual/abi.xml: Fix typo.
	* doc/html/manual/abi.html: Likewise.

From-SVN: r244658

libstdc++-v3/ChangeLog

 2017-01-19  Jonathan Wakely  <jwakely@redhat.com>
 
+	* doc/xml/manual/abi.xml: Fix typo.
+	* doc/html/manual/abi.html: Likewise.
+
 	PR libstdc++/67085
 	* include/bits/predefined_ops.h (_Iter_less_val, _Val_less_iter): Add
 	converting constructors from _Iter_less_iter.

libstdc++-v3/doc/html/manual/abi.html

@@ -173,7 +173,7 @@ compatible.
     <code class="literal">20160427</code> value of the macro in the 6.1.0 release,
     but there are features supported in the 6.1.0 release that are not
     supported in 5.4.0 release.
-    You also can't test for the the exact values listed below to try and
+    You also can't test for the exact values listed below to try and
     identify a release, because a snapshot taken from the gcc-5-branch on
     2016-04-27 would have the same value for the macro as the 6.1.0 release
     despite being a different version.

libstdc++-v3/doc/xml/manual/abi.xml

@@ -418,7 +418,7 @@ compatible.
     <literal>20160427</literal> value of the macro in the 6.1.0 release,
     but there are features supported in the 6.1.0 release that are not
     supported in 5.4.0 release.
-    You also can't test for the the exact values listed below to try and
+    You also can't test for the exact values listed below to try and
     identify a release, because a snapshot taken from the gcc-5-branch on
     2016-04-27 would have the same value for the macro as the 6.1.0 release
     despite being a different version.