[Buildroot] [git commit branch/2020.05.x] docs/manual/adding-packages-generic.txt: fix typo

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=a75c75c569e234f0c462de3dad3cfeb78e25aa79
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2020.05.x

LIBTOO_SOURCE -> LIBFOO_SOURCE

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit 31e6e05f7236bea4eba7825c6e78bdd1d41af66b)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 docs/manual/adding-packages-generic.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/manual/adding-packages-generic.txt b/docs/manual/adding-packages-generic.txt
index 568daaeb8d..b8bfcb4aff 100644
--- a/docs/manual/adding-packages-generic.txt
+++ b/docs/manual/adding-packages-generic.txt
@@ -452,7 +452,7 @@ not and can not work as people would expect it should:
   of the manifest file for this package.
 
 * +LIBFOO_ACTUAL_SOURCE_TARBALL+ only applies to packages whose
-  +LIBFOO_SITE+ / +LIBTOO_SOURCE+ pair points to an archive that does
+  +LIBFOO_SITE+ / +LIBFOO_SOURCE+ pair points to an archive that does
   not actually contain source code, but binary code. This a very
   uncommon case, only known to apply to external toolchains which come
   already compiled, although theoretically it might apply to other