Change expat url and fix a grammar issue.

packages.ent

@@ -158,7 +158,7 @@
 
 <!ENTITY expat-version "2.7.1">
 <!ENTITY expat-size "485 KB">
-<!ENTITY expat-url "&sourceforge;expat/expat-&expat-version;.tar.xz">
+<!ENTITY expat-url "&github;/libexpat/libexpat/releases/download/R_2_7_1/expat-&expat-version;.tar.xz">
 <!ENTITY expat-md5 "9f0c266ff4b9720beae0c6bd53ae4469">
 <!ENTITY expat-home "https://libexpat.github.io/">
 <!ENTITY expat-fin-du "14 MB">

part3intro/toolchaintechnotes.xml

@@ -242,7 +242,7 @@
         <para>
           The build system should not attempt to run any generated machine
           code supposed to be executed on <quote>the host.</quote>  For
-          example, when building an utility natively, its man page can be
+          example, when building a utility natively, its man page can be
           generated by running the utility with the
           <parameter>--help</parameter> switch and processing the output,
           but generally it's not possible to do so for a cross-compilation