[PATCH 2/2] Consistent variable name make less confusion

[Cao jin]

In chapter 8.7 "The `call' Function" of `info make`, there is inconsistent
variable name between example and description as following:

------------------------------------------------
  This macro simply reverses its arguments:

     reverse = $(2) $(1)

     foo = $(call reverse,a,b)

Here FOO will contain `b a'.
------------------------------------------------

Using "FOO" in both part for consistency.
---
 doc/make.texi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/make.texi b/doc/make.texi
index 343927b..589dd53 100644
--- a/doc/make.texi
+++ b/doc/make.texi
@@ -7651,7 +7651,7 @@ This macro simply reverses its arguments:
 @smallexample
 reverse = $(2) $(1)
 
-foo = $(call reverse,a,b)
address@hidden = $(call reverse,a,b)
 @end smallexample
 
 @noindent
-- 
2.1.0