docs: spdlog and docopt are actually required for build

I somehow thought that this is about the Catch framework for unit tests.
Sorry.

Change-Id: I357f491c5f332ea6bc7496fd017f5c217482ab92
diff --git a/index.md b/index.md
index ebb34eb..0823996 100644
--- a/index.md
+++ b/index.md
@@ -36,8 +36,8 @@
 All of these projects have to be checked out and made available to Buildroot via a `local.mk` file in the build dir:
 
 ```sh
-#DOCOPT_CPP_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/docopt/docopt.cpp
-#SPDLOG_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/gabime/spdlog
+DOCOPT_CPP_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/docopt/docopt.cpp
+SPDLOG_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/gabime/spdlog
 LIBYANG_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/CESNET/libyang
 SYSREPO_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/sysrepo/sysrepo
 LIBNETCONF2_OVERRIDE_SRCDIR = /home/cesnet/gerrit/github/CESNET/libnetconf2