docs: Fix assumed copy+paste error.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

docs/buildroot.html

@@ -1031,7 +1031,7 @@ $(eval $(call GENTARGETS,package,libfoo,host))
 
       <li><code>LIBFOO_SOURCE</code> may contain the name of the tarball of
       the package. If <code>HOST_LIBFOO_SOURCE</code> is not specified, it
-      defaults to <code>LIBFOO_VERSION</code>. If none are specified, then
+      defaults to <code>LIBFOO_SOURCE</code>. If none are specified, then
       the value is assumed to be
       <code>packagename-$(LIBFOO_VERSION).tar.gz</code>.<br/>Example:
       <code>LIBFOO_SOURCE = foobar-$(LIBFOO_VERSION).tar.bz2</code></li>

docs/manual/adding-packages-gentargets.txt

@@ -131,7 +131,7 @@ information is (assuming the package name is +libfoo+) :
 
 * +LIBFOO_SOURCE+ may contain the name of the tarball of
   the package. If +HOST_LIBFOO_SOURCE+ is not specified, it
-  defaults to +LIBFOO_VERSION+. If none are specified, then
+  defaults to +LIBFOO_SOURCE+. If none are specified, then
   the value is assumed to be
   +packagename-$(LIBFOO_VERSION).tar.gz+. +
   Example: +LIBFOO_SOURCE = foobar-$(LIBFOO_VERSION).tar.bz2+