Fix typo in previous change's ChangeLog.

ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* INSTALL: Document this.
 
 	Clean up extern decls a bit.

etc/ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* NEWS: Document this.
 
 2014-08-29  Leo Liu  <sdl.web@gmail.com>

lib-src/ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
 	(am__v_CC_0, am__v_CC_1, AM_V_CCLD, am__v_CCLD_, am__v_CCLD_0)
 	(am__v_CCLD_1): New macros, taken from Automake.

lwlib/ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
 	(am__v_CC_0, am__v_CC_1): New macros, taken from Automake.
 	(.c.o): Use them.

oldXMenu/ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
 	(am__v_CC_0, am__v_CC_1): New macros, taken from Automake.
 	(.c.o): Use them.

src/ChangeLog

 2014-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
-	--enable-silent-warnings now suppresses more chatter.
+	--enable-silent-rules now suppresses more chatter.
 	* Makefile.in (AM_DEFAULT_VERBOSITY, AM_V_CC, am__v_CC_)
 	(am__v_CC_0, am__v_CC_1, AM_V_CCLD, am__v_CCLD_, am__v_CCLD_0)
 	(am__v_CCLD_1): New macros, taken from Automake.